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# Lottery-like preferences and the MAX effect in the cryptocurrency market

*Financial Innovation*
**volume 7**, Article number: 74 (2021)

## Abstract

We investigate the significance of extreme positive returns in the cross-sectional pricing of cryptocurrencies. Through portfolio-level analyses and weekly cross-sectional regressions on all cryptocurrencies in our sample period, we provide evidence for a positive and statistically significant relationship between the maximum daily return within the previous month (MAX) and the expected returns on cryptocurrencies. In particular, the univariate portfolio analysis shows that weekly average raw and risk-adjusted return differences between portfolios of cryptocurrencies with the highest and lowest MAX deciles are 3.03% and 1.99%, respectively. The results are robust with respect to the differences in size, price, momentum, short-term reversal, liquidity, volatility, skewness, and investor sentiment.

## Introduction

With the invention of Bitcoin (Nakamoto 2008) followed by altcoins, the skeptical yet unstoppable rise of the cryptocurrency market has drawn significant attention in recent years. This unique financial market provides many key features to be explored. One of these features is the effect of maximum daily return (MAX) on cryptocurrency prices. In their seminal paper, Bali et al. (2011) introduce the MAX effect showing that stocks with extreme historical positive returns are inclined to exhibit lower returns in the future. This effect in asset pricing has received empirical support by many studies in the stock market literature, including Fong and Toh (2014), Barinov (2018), and Hung and Yang (2018). In this study, following Bali et al. (2011), we investigate the role of lagged extreme positive returns in the cross-sectional pricing of cryptocurrencies.^{Footnote 1}

Recently, the cryptocurrency market has attracted increased attention from investors as it offered a brand new and distinguished investment opportunity.^{Footnote 2} Unlike other financial assets, cryptocurrencies are based on electronic cash payment systems without any participation of higher authority or physical representation. It provides online trading through an algorithm that helps trace transactions. This attractive financial asset has an infinite divisibility with low transaction costs. The literature has indicated certain features of the cryptocurrency market, such as price clustering (Urquhart 2017), diversification benefits (Corbet et al. 2018a; Kajtazi and Moro 2019; Urquhart and Zhang 2019; Akhtaruzzaman et al. 2020), pricing bubbles (Corbet et al. 2018b), volatility dynamics (Katsiampa et al. 2019; Shen et al. 2020; Akyildirim et al. 2020), and arbitrage opportunities (Makarov and Schoar 2020).

A group of recent studies investigate the predictability of cryptocurrencies, that is, the inefficiency in this market. However, the results are somewhat contradictory.^{Footnote 3} For example, Caporale et al. (2018) examines the return persistence—and therefore predictability—of the cryptocurrency market and shows a positive correlation between past and future returns of four main cryptocurrencies. Similarly, Zhang et al. (2018) and Al-Yahyaee et al. (2018) report inefficiency in the cryptocurrency market, and Tzouvanas et al. (2019) shows that momentum effect exists in the short-term. Akyildirim et al. (2021) finds evidence that the cryptocurrency market is inefficient even in the weak form as it is possible to predict future returns by applying machine learning tools on historical prices.^{Footnote 4} Contrariwise, Vidal-Tomas and Ibanez (2018) and Sensoy (2019) argue that the efficiency of Bitcoin has evolved over time. Focusing on momentum effects in cryptocurrencies, Grobys and Sapkota (2019) indicates a slight efficiency in the cryptocurrency market. Wei (2018) shows that as market liquidity increases, return predictability diminishes. However, the study reports signs of efficiency improvement only for Bitcoin while other cryptocurrencies remain inefficient.

As stated above, the predictability of cryptocurrency returns has been studied in detail by many researchers in the recent years. However, there is room to explore this concept, especially with respect to different dimensions, such as investor preferences. For example, empirical literature provides evidence that investors exhibit preference for lottery-like assets. Kumar (2009) documents the likelihood of individual investors to choose assets with a relatively low probability of a large payoff. The author defines these assets as low-priced with high idiosyncratic volatility and high idiosyncratic skewness. Following this argument, Bali et al. (2011) investigate the investor preference over lottery-like stocks using MAX as a proxy for extreme returns. In addition, they argue that regarding the tendency to extreme positive returns, these under-diversified investors show preference for skewness. Moreover, Fong and Toh (2014) uncover the dependency of MAX effect on investor sentiment and show that certain groups of institutional investors are also prone to gamble in high MAX stocks. Previous studies have shown that, in addition to the US equity market, European (Annaert et al. 2013; Walkshäusl 2014), Australian (Zhong and Gray 2016), Hong Kong (Chan and Chui 2016), Chinese (Nartea et al. 2017), and Brazilian (Berggrun et al. 2019) stock markets demonstrate the presence of the MAX effect.

Motivated by these different lines of literature, we investigate whether and how the MAX effect exists in the cryptocurrency market. Following Bali et al. (2011), we start by sorting cryptocurrencies according to their maximum daily return in the past month. We examine weekly returns on the resulting portfolios for the period between January 2014 and September 2020.^{Footnote 5} The average difference between weekly returns on the highest and lowest value-weighted MAX portfolios is found to be 3.03%, whereas the difference in corresponding three-factor alphas is 1.99%, both being significant with the Newey and West (1987) adjusted t-stat of 4.10 and 3.72, respectively. The results are robust to sorting cryptocurrencies each week based on averages of two, three, four, and five highest daily returns within the past month. This suggests that portfolios with the highest past extreme returns outperform portfolios with the lowest past extreme returns in the future. In addition to the documented investor preference over lottery-like assets, a positive difference between high MAX and low MAX portfolios indicates a permanent impact of extreme positive returns. For further examination, we perform bivariate portfolio analysis on raw returns and compare three-factor alphas, controlling for various characteristics, such as size, price, momentum, short-term reversal, and illiquidity. The bivariate analysis differs from the univariate analysis by double sort where we first categorize coins according to a certain characteristic and then sort by MAX to detect the MAX effect cleared from any other potential impact. The bivariate portfolio analysis and Fama and MacBeth (1973) cross-sectional regressions provide supporting evidence for the MAX effect. The univariate regression of MAX on lagged MAX, as well as the multivariate regression with seven additional control variables, produces positive, considerably large, and extremely significant MAX coefficient.

We contribute to the cryptocurrency literature by investigating the relationship between maximum daily returns and expected future returns. Coin-level cross-sectional regressions show that the MAX effect has an explanatory power over future cryptocurrency returns. Our results contradict with the findings of Grobys and Sapkota (2019), Jia et al. (2020), and Grobys and Junttila (2021). Grobys and Sapkota (2019) report no supporting evidence of momentum effects by testing 143 cryptocurrencies and indicate that the cryptocurrency market is not as inefficient as earlier studies suggest. Moreover, Jia et al. (2020) examine the predictive power of higher moments on the cross-section of expected returns using 84 cryptocurrencies. They document a significant return predictability of higher moments and a negative significant relationship between positive extreme returns and future returns. Similarly, Grobys and Junttila (2021) investigate the speculative behavior in the cryptocurrency market by utilizing a data set of 20 coins excluding Bitcoin for the period between January 2016 and December 2019. They report that investors tend to prefer cryptocurrencies with high payoffs and low subsequent returns. However, we note that these studies have limited samples, and we believe that the sample size is crucial for obtaining accurate results. Therefore, in this analysis, we use all cryptocurrencies over $5 million market capitalization with publicly available data. This gives us 17 cryptocurrencies at the beginning of our sample period, which reaches up to 523 cryptocurrencies in the end. Our sample is very close to the entire universe of cryptocurrencies traded in the market, which enhances the robustness of our findings.^{Footnote 6} Furthermore, the conclusion of Li et al. (2020a) is consistent with our results that cryptocurrencies with the highest extreme returns pursue their superior performance in the future.

In this study, we additionally analyze the volatility effect on subsequent cryptocurrency returns. Ang et al. (2006) report that there exists a negative relationship between idiosyncratic volatility and expected returns, whereas Zhang and Li (2020) argue a contrary positive relation for cryptocurrencies. We find a high correlation between idiosyncratic volatility and maximum daily returns and suspect whether MAX acts as a substitute for volatility, which would make this effect transient in the cryptocurrency market. We examine this problem by performing bivariate portfolio analysis on MAX, wherein the sorting on the volatility component is performed by using both Garman and Klass (1980) volatility (VOL) and idiosyncratic volatility (IVOL) for robustness. Precisely, we first sort portfolios based on maximum daily returns, controlling for VOL (IVOL), and report a value-weighted average raw difference between high MAX and low MAX portfolios of 1.58% (0.91%) with a t-stat of 5.17 (2.72). The high significance of returns indicate that MAX effect is valid and persistent. Furthermore, when we sort portfolios according to IVOL, controlling for MAX, we obtain insignificant differences for raw return and alpha differences between the highest and lowest idiosyncratic volatility deciles. We further conduct a cross-sectional regression analysis and find supporting evidence for a significant MAX effect and an insignificant volatility effect over expected returns. Consequently, the positive explanatory power of MAX on subsequent returns is robust to controls for various volatility measures.

Moreover, we examine the relationship between extreme positive returns and skewness. Empirical findings document that more positively skewed portfolios yield subsequent lower returns (Harvey and Siddique 2000; Smith 2007; Mitton and Vorkink 2007; Conrad et al. 2013). However, Brunnermeier and Gollier (2007) and Barberis and Huang (2008) theoretically show that this result is more likely to be reasoning from the overoptimism for low-price and low-probability states in which extreme returns are overweighted. Studies on cryptocurrencies present conflicting results on the impact of skewness on the cross-section of returns (Balcilar et al. 2017; Wei 2018). In addition, Jia et al. (2020) indicate that return predictability of skewness is affected by extreme positive returns. Therefore, we further analyze the relationship between MAX and skewness to test whether extreme positive returns proxy for skewness. We use two different measures, total skewness (TSKEW) and idiosyncratic skewness (ISKEW) (Boyer et al. 2010), and conduct bivariate portfolio analyses, along with cryptocurrency-level cross-sectional return regressions. Our findings demonstrate that the MAX effect is robust when we control for total and idiosyncratic skewness.

Finally, we investigate the impact of investor sentiment on maximum daily returns as many studies in the empirical literature show that investor sentiment has an effect on cross-sectional returns (Baker and Wurgler 2006, 2007; Da et al. 2015; He et al. 2019). Specifically, Stambaugh et al. (2012) document that overpricing of stocks is more prevalent during high sentiment periods. Fong and Toh (2014) demonstrate the dependence of MAX effect over investor sentiment and report that—controlling for the past sentiment—the significance of MAX effect decreases. Regarding the crytocurrency market, Karalevicius et al. (2018) report that investors are inclined to overreact to news on media; thus, Bitcoin prices act according to the sentiment direction. In addition, Polasik et al. (2015) indicate that Bitcoin returns are contingent upon popularity, media sentiment, and the total number of transactions. To investigate the speculative bubbles with relatively high returns in the cryptocurrency market, Chen and Hafner (2019) utilize StockTwits sentiment analysis and report high volatility during low sentiment periods. Considering the sentiment impact reported in the literature, we conduct a bivariate portfolio analysis, controlling for the investor sentiment. We observe that the difference between high MAX and low MAX value-weighted portfolio raw returns equals 2.80% (3.25%) with a Newey-West adjusted t-stat of 3.16 (1.98) during the low (high) sentiment period. Furthermore, we plot the time-series of cumulative long-short portfolio returns and investor sentiment. In line with the findings of Fong and Toh (2014), in the cryptocurrency market, we report that the performance of long-short hedge portfolio based on MAX is higher following high sentiment periods. Our results support the momentum impact of extreme positive returns. Nevertheless, the MAX effect continues to be robust after controlling for the investor sentiment as it remains significant in both high and low sentiment states.

The remainder of the paper is organized as follows. Second section presents univariate and bivariate portfolio-level analyses and coin-level cross-sectional regressions. Third section discusses the relationship between extreme returns and volatility measures, while fourth and fifth sections focus on the connection of extreme returns with skewness and investor sentiment, respectively. Finally, sixth section concludes the paper.

## Maximum daily return and the cross-section of expected returns

We use daily closing prices of all cryptocurrencies with publicly available data.^{Footnote 7} We exclude cryptocurrencies with market capitalization below $5 million, and we incorporate a new coin into the sample after waiting for six months.^{Footnote 8} The data source is CoinMarketCap (https://coinmarketcap.com/coins/), and our sample spans the period from the beginning of January 2014 to the end of September 2020. Sample size starts with only 17 cryptocurrencies at the beginning and reaches up to 523 cryptocurrencies by the end of the period under examination.

### Variable construction

We construct most of our variables following Bali et al. (2011). Our variable of interest is the maximum daily return within the past month (*MAX*), calculated weekly for each coin, as described in Eq. (1).

where \(\text {R}_{i,d}\) is the return on cryptocurrency *i* on day *d*, and \(\textit{D}_{m}\) is the number of trading days in month m.^{Footnote 9} To estimate *BETA*, we follow Scholes and Williams (1977) and Dimson (1979) and consider lag, current, and lead returns on market index. We estimate Eq. (2) weekly for each coin using daily returns within a month.

where \(\text {R}_{m,d}\) is the cryptocurrency market portfolio return on day *d*, and \(\text {r}_{f,d}\) is the risk-free rate on day *d*.^{Footnote 10} We measure *SIZE* by the natural logarithm of the cryptocurrency’s market capitalization by the end of previous week. As another size variable, we measure *PRICE* by the natural logarithm of one plus the cryptocurrency’s price by the end of previous week. The momentum variable (*MOM*) is calculated weekly for each coin as the cumulative return over the previous three weeks starting two weeks ago, that is, the cumulative return from week t-4 to week t-2. Short-term reversal (*REV*) is defined as the cumulative return on cryptocurrency *i* within the past week, that is, the cumulative return in week t-1. To measure illiquidity (*ILLIQ*), we follow Amihud (2002) and calculate the ratio of absolute daily cryptocurrency return to its mean dollar trading volume each week, as shown in Eq. (3).

where \(\text {VOLD}_{i,d}\) is the respective trading volume in dollars and D is the total number of trading days in a week. Our final variable of interest is volatility (*VOL*). To estimate weekly volatility of each coin, we follow Garman and Klass (1980) and use Eq. (4).

where *N* is the total number of trading days in a month and *D* is the total number of trading days in a week. \({H}_{i,d}\), \({L}_{i,d}\), \({C}_{i,d}\) and \({O}_{i,d}\) are the highest, lowest, closing, and opening price of cryptocurrency *i*, respectively, on day *d*.^{Footnote 11}

Table 1 shows descriptive statistics of variables. Our main variable of interest, MAX, has a mean value of 22% with a lower median value of 16%. In addition, MOM, REV, and VOL averages are 7%, 2%, and 91%, respectively. Mean and median values of ILLIQ is slightly low, which indicates that we have been able to remove the most illiquid coins out of the sample.

### Univariate portfolio analysis

We form decile portfolios by sorting cryptocurrencies based on MAX values and present the value-weighted and equal-weighted average weekly returns in Table 2. Portfolio 1 (10) is the portfolio of cryptocurrencies with the lowest (highest) maximum daily returns during the previous month. The first column of Table 2 shows that the value-weighted average raw return difference between decile 10 (high MAX) and decile 1 (low MAX) is 3.03% per week with a corresponding Newey-West adjusted t-stat of 4.10. Similarly, as shown the third column of Table 2, the raw difference between the low MAX and high MAX equal-weighted portfolio returns average 2.45% per week with a t-statistic of 3.22. Table 2 also reports the intercept terms (alphas) from regressions of the value-weighted and equal-weighted portfolio returns on a constant, the excess market return, a size factor, and a momentum factor, following Fama and French (1993) and Carhart (1997). The excess cryptocurrency market return is the difference between cryptocurrency market index return and the risk-free rate. For the size factor, we follow Liu et al. (2020) and Zhang and Li (2020) and split cryptocurrencies per week into three groups by market capitalization. We form value-weighted portfolios for each size group and calculate the difference between average returns of small and big size portfolios. Similarly, for the momentum factor, we split cryptocurrencies per week into three groups by momentum.^{Footnote 12} We construct value-weighted portfolios for each momentum group, and we calculate the difference between average returns of the highest and lowest momentum portfolios. The difference between the high MAX and low MAX value-weighted portfolio’s three-factor alphas equals 1.99% with a Newey-West adjusted t-stat of 3.72, as shown in the last two rows of Table 2. The difference between the high MAX and low MAX equal-weighted portfolio alphas equals 2.44% with a Newey-West t-stat of 3.34. For both value-weighted and equal-weighted portfolios, the differences between average returns and three-factor alphas are both economically and statistically significant. In addition, we observe that as average MAX increases, both average returns and alphas increase monotonically. Contrary to the significant negative MAX effect in equity market (Bali et al. 2011; Hung and Yang 2018), these findings show that portfolios of cryptocurrencies with the highest extreme returns continue to exhibit superior performance in the future.

We repeat the univariate portfolio analysis by considering not only the unique extreme positive return (MAX) but also the averages of *N* (*N* = 2, 3, 4, and 5) highest daily returns within the past month, denoted by MAX(*N*). Table 3 presents the results of the analysis. Panel A reports the average return and alpha differences between the highest and lowest average MAX(*N*) for the value-weighted portfolios, and Panel B shows those for the equal-weighted portfolios. We also show the results from Table 2 in the first column of Table 3 for ease of comparison. The value-weighted and equal-weighted average raw return differences between the high MAX(*N*) and low MAX(*N*) remain economically and statistically significant.

Looking at Tables 2 and 3, we may argue that investors expect the extreme positive daily return behavior to last in the future and thus they may be willing to purchase these coins for higher prices. To understand the persistence of the MAX effect and to discuss the relationship between extreme positive returns and certain characteristics of cryptocurrencies, we run the Fama and MacBeth (1973) regression models. In particular, for each week, we regress the maximum daily return within that particular month on the maximum daily return from the past month and seven lagged control variables. As explained in “Variable construction” section, our control variables are the market beta (BETA), the log of market capitalization (SIZE), the price of cryptocurrency (PRICE), the return over three weeks prior to the past week (MOM), the return in the previous week (REV), the Amihud illiquidity measure (ILLIQ), and the Garman-Klass volatility measure (VOL). For each of the 348 sample weeks, we winsorize all variables in the cross-section at 5% level from both upper and lower tails to get rid of the outlier effect without removing any observation. Table 4 presents the average coefficients form cross-sectional regressions and the Newey-West adjusted t-statistics. The first two rows of Table 4 show that the coefficient of MAX variable is positive with an extremely high statistical significance and the adjusted R-squared value over 68%. When we add the seven control variables to the regression, MAX coefficient remains positive and highly significant with the adjusted R-squared of over 75% while all other variables become insignificant. This significant explanatory power of MAX in the univariate regression on lagged MAX and multivariate regression with additional seven lagged variables indicate that a positive relation exists between the maximum daily return over the previous month and expected extreme positive cryptocurrency returns. In other words, coins with extreme positive returns are inclined to outperform in the following month.

We further investigate the two extreme deciles (low MAX and high MAX) in the post-formation period and report the descriptive statistics in Table 5. We use approximately 55,000 weekly returns on cryptocurrencies. Unlike the equal-weighted portfolio calculation in Table 2 with different number of coins, we weigh all returns equally as presented in the first row of Table 5. For this reason, the mean return for low MAX is lower than the equal-weighted portfolio average return (in Table 2), and the mean return for high MAX is higher than that of Table 2. When compared to low MAX coins, high MAX coins have higher average returns with higher volatility and slightly more positive skewness. Moreover, upper tail behavior in percentiles presents that the high MAX returns at 90th, 95th, and 99th percentiles are nearly twofold of low MAX returns. The results demonstrate that there is a higher probability for high MAX coins to preserve extreme positive returns in the future.

The analyses thus far uncover some evidence against the investor preference over lottery-like assets, which have a slight chance of a large future payoff in the future (Kumar 2009; Bali et al. 2011). The MAX variable with a characteristic of high positive skewness construct a suitable basis for lottery-like behavior (Fong and Toh 2014; Zhu et al. 2020). However, in the cryptocurrency market, we observe that if we buy a well performing coin portfolio and sell a poorly performing portfolio, there is a high probability of continuing to win significant positive returns in the future. Hence, the behavior of the cryptocurrency market signals inefficiency and resembles movement direction of the momentum factor (Jegadeesh and Titman 1993). To understand more about the MAX portfolio composition, we report the summary statistics of cryptocurrencies in the decile portfolios in Table 6. The table presents the averages of the weekly median values of characteristics, which are the maximum daily return (MAX), the cryptocurrency market beta, the market capitalization (in millions of dollars), the price (in dollars), the cumulative return over the previous three weeks prior to the week before (MOM), the cumulative return over the past week (REV), the Amihud illiquidity measure (scaled by 10\(^{-5}\)), and the Garman-Klass volatility measure.

Table 6 shows that as we move from decile 1 (low MAX) to decile 10 (high MAX), the average of weekly median MAX values increase from 5.38% to 59.56% whereas the size values decrease from $426.75 million to $21.92 million. This indicates that high MAX portfolios are dominated by smaller-sized cryptocurrencies. This result is consistent with the findings of Chan et al. (1991) and Fama and French (1992) who document the high likelihood of relatively smaller firms to return higher profits. As the average of median daily maximum return increases through decile 1 to decile 10, the price also diminishes. The increase in the market beta indicates that cryptocurrencies in high MAX decile are slightly more exposed to market risk. The average values of the median momentum and short-term reversal variables both rise as we move from low MAX decile to high MAX decile. These findings also support that past winners continue to perform better in the future (Jegadeesh and Titman 1993). Furthermore, a mild increase exists in the illiquidity measure. Specifically, high MAX coins are found to be less liquid and more volatile. This contrary relationship is consistent with the findings of Wei (2018).

### Bivariate portfolio analysis

In this section, our goal is to understand whether the relationship between maximum daily returns and future returns on cryptocurrencies persists as discussed, when we control for size, price, momentum, short-term reversal, and liquidity. Following Bali et al. (2011), we perform the bivariate portfolio analysis where we first sort cryptocurrencies by a certain characteristic (such as size). We then categorize each of these deciles according to MAX. Thus, we obtain 100 cryptocurrency portfolios. Table 7 presents the results for MAX portfolio deciles by averaging across the ten deciles sorted by the characteristics.^{Footnote 13} Average returns and corresponding alphas for value-weighted portfolios and equal-weighted portfolios are reported in Panel A and Panel B of Table 7, respectively.

Bivariate portfolio analysis presents the supporting evidence for our findings in “Univariate portfolio analysis” section. When we control for size, the value-weighted mean return difference between decile 10 (high MAX) and decile 1 (low MAX) is 2.73% with a Newey-West adjusted t-stat of 7.70. Furthermore, the corresponding value for the value-weighted average risk-adjusted return difference equals 2.47% with a t-stat of 2.71. Similarly, after controlling for price, momentum, short-term reversal, and liquidity, the value-weighted average return differences between the high MAX and low MAX portfolios are 1.75%, 1.69%, 1.48%, and 1.76% per week, respectively. For equal-weighted portfolios, average return differences between high MAX and low MAX portfolios are 2.08%, 1.82%, 1.77%, 1.70%, and 1.56% per week, respectively. All mean raw differences are economically and statistically significant. For value-weighted and equal-weighted portfolios, the differences between alpha values of high MAX and low MAX coins are statistically significant. As these results coincide with the findings of univariate portfolio studies, none of the cross-sectional effects, such as size, price, momentum, short-term reversal nor liquidity is powerful enough to explain further the highest extreme returns to high MAX cryptocurrencies.

### Cross-sectional return regressions

The portfolio analyses we have conducted thus far give supporting results of a positive MAX effect. In this section, we investigate the coin level cross-sectional relation between MAX and expected returns to observe whether a connection exists at the individual level.^{Footnote 14} We run Fama and Macbeth regressions of cryptocurrency returns on the lagged maximum daily return (MAX), market beta (BETA), log of market capitalization (SIZE), price of cryptocurrency (PRICE), return over three weeks prior to the past week (MOM), return in the previous week (REV), and the Amihud illiquidity measure (ILLIQ), as shown in Eq. (5).

where \(\text {R}_{i,t+1}\) is the realized return on cryptocurrency *i* in week *t+1*, and all independent variables are lagged one week. Rules on winsorization still apply. Table 8 presents the time-series averages of the slope coefficients over 348 weeks from January 2014 to September 2020.

The univariate regression of maximum daily return on future cryptocurrency returns results in a positive and statistically significant relationship. The average slope, \(\gamma _{1,t}\), equals 8.21% with a robust t-stat of 3.14. Considering the spread between median of MAX between decile 10 and decile 1 from Table 6, we can estimate approximately 445 basis points difference in the expected weekly returns among high MAX and low MAX deciles of median coins. The economic magnitude of this difference is extremely significant as well as encouraging for the investors to buy cryptocurrencies with the highest daily extreme returns. In addition to MAX, the univariate regressions show that SIZE and PRICE have an explanatory power over the expected returns, which is consistent with the findings of Li et al. (2020b). The average slopes of MOM (3.92%) and REV (9.62%) variables are positive and significant at 5% and 1%, respectively. Momentum having a positive explanatory power over future returns coincides with the findings of Liu et al. (2020) while contradicting with the results of Grobys and Sapkota (2019). When the regression is run with the six control variables except MAX, no significant explanatory variable is found. Nevertheless, as shown in the last row of Table 8, when we embrace all variables in the regression, MAX shows a higher significance with a coefficient of 28.43% and a t-stat of 6.14. The regression results show that, contrary to Jia et al. (2020), the cross-sectional regressions are a strong evidence for an economically and statistically significant positive relation between extreme returns and expected returns in the cryptocurrency market.

## Extreme positive returns and volatility

The literature on cross-sectional studies of volatility and expected return have revealed inconsistent results (Ang et al. 2006; Bali and Cakici 2008; Fu 2009). In the cryptocurrency market, Zhang and Li (2020) report a positive and nontemporal relationship between idiosyncratic volatility and future returns using more than 500 coins. In particular, cryptocurrencies with a high maximum daily return within a month also have high volatility, as shown in Table 6. Depending on the substantial connection between idiosyncratic volatility and maximum daily returns, we examine whether MAX effect acts as a proxy for volatility; this section investigates in detail the relation among them. First, Table 9 shows the average weekly cross-sectional correlation coefficients between six variables: the maximum daily return within the past month (MAX), average of the highest five daily returns within the past month (MAX(5)), the minimum daily return within the past month (MIN) as described in Eq. (6), monthly realized total volatility (TVOL) as described in Eq. (7), monthly realized idiosyncratic volatility (IVOL) as described in Eq. (8), the and Garman-Klass volatility (VOL).

where \(\text {R}_{i,d}\) is the return on cryptocurrency *i* on day *d* and \(\textit{D}_{m}\) is the number of trading days in month *m*,

with \(\epsilon {_{i,d}}\) is the innovation on cryptocurrency obtained from Eq. (9).

Table 9 shows that in our cryptocurrency sample, very high average cross-sectional correlations exist between TVOL and IVOL (coefficient of 0.99), TVOL and MAX (coefficient of 0.77), and IVOL and MAX (coefficient of 0.80). MAX and MAX(5) are highly correlated as expected, which indicates that they can act as perfect substitutes for each other. On the contrary, there is a very low correlation between Garman-Klass volatility (VOL) and maximum daily return (MAX), which is why we use this variable as the volatility factor in our analysis.

Second, we perform the bivariate portfolio analysis to further examine the relationship between volatility and expected returns on cryptocurrencies. Similarly, as discussed in “Bivariate portfolio analysis” section and presented in Table 7, we sort cryptocurrencies by MAX, controlling for VOL and IVOL. In order to do that, we form decile portfolios that are sorted based on VOL and IVOL. We then rank each volatility decile according to MAX and conduct value-weighted and equal-weighted portfolio analysis.^{Footnote 15} The results for average returns across MAX deciles, the corresponding three-factor alphas, and the Newey-West adjusted t-statistics are shown in Panel A of Table 10. The value-weighted average raw difference between decile 10 (high MAX) and decile 1 (low MAX) is 1.58% (0.91%) per week with a t-stat of 5.17 (2.72) when we control for VOL (IVOL). Alpha values are also economically and statistically significant. By allowing deciles to contain cryptocurrencies with all levels of volatility and dispersion based on MAX, we show that the power of MAX effect to explain future returns persists. In addition to value-weighted portfolios, the differences between high MAX and low MAX deciles and their significance levels are conformable to those in Tables 3 and 7.

Furthermore, in Panel B of Table 10, we conduct the reverse sort. We form deciles of cryptocurrencies ranked by IVOL and VOL, controlling for extreme positive returns. The average raw differences between the high VOL and low VOL deciles of both value-weighted and equal-weighted portfolios as well as three factor alpha differences remain insignificant. The results in Table 10 report no effect of volatility and idiosyncratic volatility on future returns, which is consistent with the findings of Bali and Cakici (2008) but contradicts with the significant positive relation indicated by Zhang and Li (2020). We observe that when we control for volatility and idiosyncratic volatility, coins with extreme positive returns continue to show superior performance in the future. However, when the data is controlled for MAX, the effect of volatility and idiosyncratic volatility on future returns disappear. This analysis further sheds light on the positive relation between the highest extreme returns and expected returns in the cryptocurrency market.

Third, we investigate the cross-sectional relationship between volatility and expected returns. Table 11 presents the results of Fama-Macbeth regressions. Rules on winsorization still apply. In univariate regressions, the average slope of MAX is 8.21% with a t-stat of 3.14. However, the volatility coefficient (1.68%) is not significant (t-stat=1.51), which supports the finding that volatility remains inefficient in explaining future returns in equal-weighted portfolios.^{Footnote 16} When future returns are regressed on MAX and volatility together, the significance of MAX increases whereas VOL remains insignificant with a negative coefficient. When six other control variables are added to the regression, the insignificance of VOL remains unchanged. We might suspect that the positive relation between idiosyncratic volatility and expected returns reported by Zhang and Li (2020) is reasoning from the fact that IVOL acts as a proxy for MAX. Furthermore, we consider MIN in our regression analysis to further understand the effect of volatility. As MIN is also highly correlated with volatility, it might exhibit a similar behavior with MAX if our results are a consequence of volatility effect. Table 11 also shows the Fama-Macbeth regression results with MAX, MIN, and VOL. The univariate regression coefficient of MIN is 9.36% with a t-stat of 2.31, which is significant at 5% level. The positive sign of MIN might indicate that a decrease in a cryptocurrency’s value does not necessarily mean lower future returns. In all of 7 regressions presented in Table 11, MAX coefficient remains statistically significant after controlling for MIN, VOL, BETA, SIZE, PRICE, MOM, REV, and ILLIQ. These results confirm our findings in univariate and bivariate analyses with the interpretation that in the cryptocurrency market, the MAX effect is not temporal and a positive relation exists between the highest extreme returns and future expected returns.

## Extreme positive returns and skewness

In this section, we investigate the connection between extreme positive returns and skewness. The literature highlights investor preference over positive skewness (Arditti 1967; Kraus and Litzenberger 1976; Scott and Horvath 1980). Harvey and Siddique (2000) shows the relationship between momentum effect and systematic skewness. By measuring conditional skewness, Harvey and Siddique (2000) and Smith (2007) indicate that portfolios with a higher skewness tend to underperform in the future. In addition, Mitton and Vorkink (2007) and Boyer et al. (2010) find negative correlation among idiosyncratic skewness and expected returns. Nevertheless, Brunnermeier and Gollier (2007) and Barberis and Huang (2008) show that at least theoretically, skewness is not the reason for these underperforming stocks. On the contrary, Wei (2018) reports strong positive skewness in cryptocurrency returns whereas Balcilar et al. (2017) show that Bitcoin returns are left-skewed. Jia et al. (2020) document that extreme positive returns have a significant effect over return predictability of higher moments. Considering the literature on the impact of skewness on expected returns, we question whether the MAX effect is robust to controls for skewness measures. We use two different measures to evaluate skewness, total skewness (TSKEW), and idiosyncratic skewness (ISKEW). TSKEW is the measure for the third moment of returns and calculated as described in Eq. (10).

where \(\text {D}_{t}\) is the number of trading days in month *t*, \(\text {R}_{i,d}\) is the return on cryptocurrency *i* on day *d*, \({\mu }_{i}\) is the average of returns on cryptocurrency *i* in month *t*, and \({\sigma }_{i}\) is the standard deviation of returns on cryptocurrency *i* in month *t*. We compute ISKEW after Boyer et al. (2010) as described in Eq. (11).

where as usual \(\text {R}_{i,d}\) is the return on cryptocurrency *i* on day *d*, \(\text {R}_{m,d}\) is the cryptocurrency market portfolio return on day *d*, \(\text {r}_{f,d}\) is the risk-free rate on day *d*, and \({\epsilon }_{i,d}\) is the idiosyncratic return on day *d*. The idiosyncratic skewness (ISKEW) of cryptocurrency *i* in month *t* equals the skewness of daily residuals \({\epsilon }_{i,d}\) in month *t*.

Initially, we conduct the bivariate portfolio analysis where we first sort cryptocurrencies based on the skewness measure and then rank each of these deciles by MAX. Table 12 presents the results of the analysis. The first (second) column of Table 12 reports that, after controlling for TSKEW (ISKEW), the value-weighted mean return difference between high MAX and low MAX deciles is 2.95% (2.65%) with a Newey-West adjusted t-stat of 8.06 (7.38). For TSKEW (ISKEW), the three-factor alpha difference is 2.67% (2.37%) with a t-stat of 6.41 (6.10). The high degree of positive significance in return and alpha differences indicate that neither total skewness nor idiosyncratic skewness explains the link between extreme positive returns and future returns.

Boyer et al. (2010) state that among other characteristics, lagged skewness might be a weak predictor for future skewness, which we wish to consider. Therefore, we perform coin-level cross-sectional regressions of TSKEW and ISKEW on lagged values of skewness and six other control variables. Rules on winsorization still apply. The results are shown in Table 13. The univariate and multivariate regressions of both TSKEW and ISKEW indicate that skewness is extremely significant to predict subsequent skewness. Nevertheless, in our next analysis, we additionally consider expected total skewness (*E*(TSKEW)) as a control variable that is fitted each week throughout the cross-sectional regressions. Table 14 reports the coefficients and corresponding Newey-West adjusted t-statistics from cross-sectional regressions of subsequent weekly returns on MAX and nine other control variables, including TSKEW, ISKEW, *E*(TSKEW).

The time-series average coefficients of extreme positive returns are all statistically and economically significant in all the specifications. In univariate regressions, coefficients of skewness measures (TSKEW, ISKEW and *E*(TSKEW)) are all positive and statistically significant. TSKEW is significant at 5%, and ISKEW and *E*(TSKEW) are significant at 10% levels. However, in the full specifications, each of these variables are statistically insignificant. Consequently, the empirically indicated positive skewness is consistent with the findings of Wei (2018). Nevertheless, contrary to the findings of Jia et al. (2020), the results show that the skewness remains insignificant to predict subsequent returns. In addition, extreme positive return impact is significantly persistent and robust to controls for skewness measures.

## Extreme positive returns and investor sentiment

The empirical literature documents that a significant relationship exists between the investor sentiment and expected stock returns (Baker and Wurgler 2007; Yang and Zhou 2015; He et al. 2019). Baker and Wurgler (2006) present lower subsequent returns, and Stambaugh et al. (2012) report common mispricing in stocks during high sentiment periods. When investors are optimistic about the subsequent returns, they might be inclined to invest in stocks with lottery-like features. This gambling tendency originates from the expectation of high-performing stocks to continue winning in the future. However, as in the theoretical model of Brunnermeier and Gollier (2007), overoptimism might result in underperforming stock investments. While Bali et al. (2011) explains this phenomenon by MAX effect, Fong and Toh (2014) indicate the dependency of MAX effect on investor sentiment. Next, if the MAX effect is induced by investor optimism, the significance will vanish when we control for the cryptocurrency market sentiment. Hence, the aim of this section is to understand the relationship between the investor sentiment and extreme positive returns.

We perform the univariate portfolio analysis to test the effect of investor sentiment on subsequent returns. We define two periods: low sentiment and high sentiment. As a proxy for market sentiment, we use Bitcoin Sentiment Index, which is constructed with regards to the Bitcoin conversations collected from Twitter, Reddit, and Bitcointalk. The value changes between 0 and 1, where 0 refers to extreme bearish and 1 refers to extreme bullish.^{Footnote 17} We categorize weekly data into bins of *low sentiment* whenever the sentiment index is below the sample median value and *high sentiment* whenever the sentiment index is above the sample median value. We report the value-weighted average raw return and three-factor alpha differences in Table 15, with the corresponding t-statistics. For low (high) sentiment periods, the mean return difference between decile 10 (high MAX) and decile 1 (low MAX) is 2.80% (3.25%) with an adjusted t-stat of 3.16 (1.98). These magnitudes are very similar with those reported in Table 2, which supports the significance of extreme positive returns to explain subsequent returns. The results are consistent with the positive MAX effect reported in our analyses. Fong and Toh (2014) claim that the high investor sentiment periods drive the MAX effect in stock markets; however, we report similar magnitudes and significance levels in both states. This indicates investor preference over lottery-like assets both following low and high sentiment periods for the cryptocurrency market, contrary to the findings of Fong and Toh (2014) in the stock market.

Furthermore, we perform long-short portfolio analysis with regards to the low MAX and high MAX decile performances. We calculate the subsequent long-short portfolio returns (high MAX decile – low MAX decile) to control whether MAX effect is driven by low or high sentiment periods. We plot the time-series of cumulative return performance and sentiment index in Fig. 1.^{Footnote 18} The figure supports the findings in Table 15 that the performance of long-short hedge portfolio based on MAX is slightly higher following high sentiment states. In addition, the cumulative return of the long-short portfolio decreases in the early sample period before moving upwards until the end. This might be interpreted as the investors acting pessimistic and taking short position whenever the sentiment index is at low levels in the beginning. Immediately after the sentiment index begins to increase, the investors in the cryptocurrency market embrace an optimistic behavior and take a long position until the end of the sample period. Nevertheless, the MAX effect is statistically significant for both high and low sentiment periods, indicating that MAX effect is also robust after controlling for investor sentiment.

## Conclusion

Investor preference for lottery-like assets is a novel phenomenon for the cryptocurrency market. Within this context, we follow Bali et al. (2011) and investigate the impact of the maximum daily return within the past month (MAX effect) on next week returns for the period from January 2014 to September 2020. The univariate and bivariate portfolio analyses show that MAX effect is present and persistent in the cryptocurrency market. The positive impact of extreme positive returns remains statistically significant when we use the averages of *N* (*N = 2, 3, 4, and 5*) highest daily returns within the previous month. In addition to the lottery-like features of stocks documented in the literature, weekly regression analyses provide strong evidence that a significant positive relation exists between extreme positive returns and expected returns in the cryptocurrency market. We further show that these results are robust after controlling for size, price, momentum, short-term reversal, and liquidity.

Moreover, we analyze the possibility of extreme positive returns acting as a substitute for either volatility or skewness. To check this, we utilize different measures for volatility and skewness and report that the explanatory power of extreme positive returns over subsequent returns continues to exist. Finally, to understand the link between extreme positive returns and investor sentiment, we categorize our data into bins of low sentiment and high sentiment, and we conduct portfolio analysis. Additionally, we investigate the time series of the long-short portfolio return to check whether cycles exist, and we control whether investor sentiment is persistent. We report that the MAX effect is also robust to controls for investor sentiment. Our results signal lack of efficiency in the cryptocurrency market by which, investors might gain an advantage while forming their portfolios. It would be prudent for market participants and fund managers to consider the effect of extreme positive returns. However, further research is necessary to make interpretations and exploit this potentially fruitful anomaly.

## Availability of data and materials

Data and materials are available upon request from the corresponding author.

## Notes

The literature on MAX effect and lottery-like preferences can be further tied to the collective opinion dynamics of investors in financial markets. For more information on this subject, see Zha et al. (2021).

As a subgroup of new Fintech innovations, cryptocurrencies have been attracting attention to the greatest extent in recent years. For more information on other novel Fintech approaches, see Kou et al. (2021a) and the references therein.

Refer to Corbet et al. (2019) for an excellent review on the literature of cryptocurrency markets.

While this study uses a direct approach in feature selection, further advancements could be applied by choosing the model features in two stages. For an example, see Kou et al. (2021b).

2000 cryptocurrencies narrow down to 973 in total, when we apply $5 million market cap filter to exclude illiquid cryptocurrencies and obtain more reliable and robust results. However, when we conduct the same analyses using all of 2000 coins, the outcomes are similar to those presented in the study. Results are available upon request.

List of cryptocurrencies are available upon request.

We thank the anonymous referee for this suggestion. Cryptocurrencies with low market capitalization show extreme low liquidity, which complicates the application of practical trading strategies in reasonable sizes. Moreover, when a coin is initially launched, price behavior might be very strange until it is adopted by users, miners, and traders. It takes some time for it to gain substantial acceptance and liquidity. Therefore, we consider cryptocurrencies with market caps over $5 million and exclude the first six months of price behavior out of our sample.

The meaning of

*trading days*in the cryptocurrency market is different from that in the traditional stock market, as the coin market is always active. In our analysis, we assume a week and a month to be 7 and 28 trading days, respectively.We construct a daily value-weighted cryptocurrency market index using all sample cryptocurrencies. Risk-free rate is the one-month T-bill return.

There exists a high cross-correlation between MAX and idiosyncratic volatility, which causes multicollinearity in the regression models. Therefore, we use Garman-Klass volatility (then the correlation coefficient between MAX and volatility becomes 0.0028) to capture the intraday information, which seems to have a considerable impact on price variability (Eross et al. 2019; Mensi et al. 2019; Jia et al. 2020).

We compute momentum as the cumulative return over the past three weeks following Liu et al. (2020).

We do not report the findings of all 100 portfolios for brevity; however, comprehensive results are available upon request.

We repeat the same bivariate portfolio analysis by replacing MAX with MAX(5) and obtain very similar results to those reported in Table 10. For brevity, we do not report these findings in the paper, but the results are available upon request.

In cross-sectional regressions, the averaging process weigh each coin equally.

Further information is available at https://www.augmento.ai/bitcoin-sentiment/.

The reason that we consider the long-short portfolio return along with the sentiment analysis is to understand whether cycles exist within our sample period following the sentiment index. Therefore, we perform autocorrelation tests for the sentiment index to analyze whether sentiment is persistent. The results of both Durbin Watson Test and Ljung-Box Q Test show that there is no evidence of residuals of sentiment returns being positively correlated. The results are available upon request.

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Funding was provided by türkiye bilimler akademisi (Grant Outstanding Young Scientist).

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Data and materials are available upon request from the corresponding author. Ahmet Sensoy gratefully acknowledges support from the Turkish Academy of Sciences - Outstanding Young Scientists Award Program (TUBA-GEBIP).

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Ozdamar, M., Akdeniz, L. & Sensoy, A. Lottery-like preferences and the MAX effect in the cryptocurrency market.
*Financ Innov* **7**, 74 (2021). https://doi.org/10.1186/s40854-021-00291-9

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DOI: https://doi.org/10.1186/s40854-021-00291-9