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The interaction between stock prices and interest rates in Turkey: empirical evidence from ARDL bounds test cointegration
Financial Innovationvolume 5, Article number: 7 (2019)
Abstract
This paper demonstrates a significant, longrunning relationship between stock prices and domestic interest rates in Turkey’s financial markets for the period of 2001 M1 – 2017 M4. Cointegration analysis is investigated using the autoregressivedistributed lag bounds (ARDL Bounds) test and vector autoregressive cointegration. Additionally, cointegrating equations such as the fully modified ordinary least square, dynamic ordinary least squares, and canonical cointegrating regression are applied to check the longrun elasticities in the concerned relationship. The ARDL Bounds and Johansen Cointegration test results show that, dynamically, both prices are significantly related to each other. The cointegrating equation outcomes demonstrate elasticities whereby both coefficients have negative signs. Additionally, the same results are corroborated by the impulse response where all variables respond negatively to each other.
Introduction
Based on the theoretical model proposed by Chen, Roll and Ross (Chen et al., 1986), stock price estimates by the expected cash flow are discounted by the interest rate. During the discounting process, the interest rates directly affect the value of the stock.
Huang et al. (Huang et al., 2016) specify that a low level of interest rates makes the discounting cash flow high, thus justifying the increase in current stock prices. Based on the stock valuation models, stock prices are predicted by the discounted value of expected cash flow. Therefore, according to the theory, the primary factor determining the value of stocks is directly related to the discounting rate, namely interest rates.
Laopodis (Laopodis, 2013) explains that expected dividends determine stock prices and interest rates with any surprises in monetary policy likely to influence stock prices, either directly via the interest rate channel or indirectly through changes in the determinants of dividends.
According to Bernanke and Reinhart (Bernanke & Reinhart, 2004), current interest rates can influence asset prices. Moreover, Assefa et al. (Assefa et al., 2017) find that interest rates have significant effects on stock returns in developed economies. Theoretically, financial markets are classified as capital and money markets, respectively. Today, it is important in both markets for participants to follow market movements before making investment decisions. All types of prices provide essential information for investors to revise their portfolios. There are many kinds of prices, including stock prices and interest rates. According to the explanation above, empirical evidence supports the view that there is a significant relationship between stock prices and interest rates.
Figure 1 shows the interest rates and stock price levels for the period 2001 M1 – 2017 M4. The graphical investigation presents evidence indicating that when interest rates dropped from 120% to under 20%, the stock market indexes increased substantially. After the 2001 crisis in Turkey, the monetary authority pursued an inflation targeting program to decrease the inflation rate. Following the monetary changes, interest rates fell substantially and remained under 20%. Additionally, the stock market responded with a substantial increase during the same period.
Assefa et al. (Assefa et al., 2017) explain that monetary policy, through interest rates, tends to affect the returns – and hence prices – of financial assets, thereby influencing economic decisions and growth. Sellin (Sellin, 2001) also surveys the literature on monetary policy and stock prices. For Turkey, Alrub et al. (Alrub et al., 2016) provide support by illustrating the outcomes of monetary policy changes in the stock market for the period of January 2002 to December 2013.
There are two main reasons for revisiting the relationship between the equity market and interest rates. First, a significant volume of literature developed by Chen, Roll and Ross (Chen et al., 1986), Campbell and Ammer (Campbell & Ammer, 1993), Thorbecke (Thorbecke, 1997), Laopodis (Laopodis, 2013), Huang et al. (Huang et al., 2016), and Assefa et al. (Assefa et al., 2017) focuses on the effects of macrovariables on stock prices.
Second, in general, Turkey is classified as a bankbased financial system, but also has a stock exchange that is integrated into the global financial market. Market participants usually prefer deposit accounts to safeguard their wealth. They also have the option to invest in the stock market, but foreigners usually place their wealth in the Borsa Istanbul as a portfolio investment. Foreigners make approximately three quarters of the investments in the stock market, while domestic residents prefer bank accounts. Therefore, this study uses the indicator of deposit interest rates as the proxy for interest rate components.
Moreover, it is favorable to use the equity price index for the component of the stock market. The interaction between both components is investigated based on the dynamics between them. Consequently, the objective of this study is to examine the relationship between both prices by applying the ARDL Bounds Test, cointegration equations, and equity capital market (ECM) for Turkey in order to substantiate evidence for this relationship. Specifically, a bivariate form of cointegration is applied to analyze the relationship between the two variables. The primary purpose of this study is to identify the shortrun and longrun relationships, as well as the elasticities of the relationship in Turkey. Therefore, this study investigates if in the case of Turkey, both the stock prices and interest rates have a longrun relationship by using the ARDL Bounds Test.
Furthermore, the elasticities of the concerned relationship produced by the cointegration equations (FMOLS, DOLS, and CCR) provide the signs of each coefficient in the possible relationship. The vast majority of studies in the literature provide the signs for coefficients in this relationship. Also, the cointegration results from the ARDL Bounds Test and the longrun elasticities are corroborated with the Johansen cointegration methods.
The rest of the article is organized as follows:

Section 2 explains the literature review.

Section 3 describes the data, model specification, and econometric methodology.

Section 4 provides the empirical results and discussion, and.

Section 5 explains the conclusion.
Literature review
Stock prices are widely investigated by scholars such as Gordon (Gordon, 1959), Blanchard (Blanchard, 1981), Campbell and Shiller (Campbell & Shiller, 1988), and Lee (Lee, 1992). Stock prices are connected to earnings and macroeconomic variables such as output and inflation dividends.
Furthermore, Chen, Roll and Ross (Chen et al., 1986) propose macroeconomic variables that are linked with the stock market under the framework of arbitrage pricing theory (APT). Nasseh and Strauss’ (Nasseh & Strauss, 2000) findings support the existence of a significant, longrun relationship between stock prices and domestic and international economic activities in six European economies. Specifically, they find a relationship between stock prices and interest rates. Asprem (Asprem, 1989) testifies to the inverse relationship between stock indices and interest rates in 10 European countries.
Therefore, the relationship between stock prices and interest rates is widely studied, and important investigations prove the negative relationship between both concerned variables. Finally, Flannery and James (Flannery & James, 1984) examine the relationship between the interest rate sensitivity of common stock returns and the maturity composition of a firm’s nominal contracts. This paper finds that common stock returns are correlated with interest rate changes.
Arpegis and Eleftheriou (Apergis & Eleftheriou, 2002) empirically analyze the relationship between stock prices and interest rates, as well as the inflation rate in Greece. They argue that according to financial theory, it is possible that interest rates have a substantial effect on the behavior of financial aggregates, such as stock prices.
The findings of Arpegis and Eleftheriou (Apergis & Eleftheriou, 2002) demonstrate that an increase in interest rates motivates investors to change their portfolio composition to hold bonds in their portfolio. On the contrary, when interest rates fall, investors choose stocks instead of bonds.
Modigliani and Cohn (Modigliani & Cohn, 1979) propose that during inflationary periods, investors capitalize equity earnings at a rate that parallels nominal interest rates, revealing the behavior of the investors, who continuously compare the prices of both markets (stock and interest rate markets) in order to revise their portfolios.
Also, Jebran et al. (Jebran et al., 2017) investigate the effect of oil price and its volatility on the stock market in Pakistan. There are also studies that investigate the factors affecting the bitcoin’s price such as Zhu et al. (Zhu et al., 2017). Moreover, Panda and Nanda (Panda & Nanda, 2017) determine the shortrun and longrun interconnectedness of stock returns in Western Europa and the global market via cointegration method.
Previous studies such as Tursoy et al. (2008) and Rjoub et al. (2009), in Turkey present empirical evidence on stock market and the interactions between macroeconomic variables. These studies predominately scrutinize the stock market and macroeconomic variable interactions within the country.
Tursoy and Faisal (Tursoy & Faisal, 2018) determine the relationship between stock prices, crude oil, and gold prices in Turkey. Likewise, Granger et al. (Granger et al., 2000) explore the link between two variables in the bivariate form by looking at stock prices and another variable.
For instance, Tursoy (Türsoy, 2017) investigates the relationship between stock prices and exchange rates in the bivariate form. This study examines the causal relationship between two important theories (traditional/portfolio) in Turkey. Another study conducted by Tursoy and Faisal (Tursoy & Faisal, 2016) evaluates the interaction between stock prices and economic growth in Turkey with the bivariate form. Also, Tursoy and Faisal (Tursoy & Faisal, 2017) study the interconnectedness of Turkey with the global market in the bivariate form.
Data and methods
Analysis of the bivariate form of the relationship explores the relationship between two important market indicators. All necessary data is obtained from the International Financial Statistics (IFS) database for the period of January 2001 to April 2017.
Model specifications
The chief relationship in this study is examined using the following equations. The variables in the bivariate form of the relationship are represented by the stock prices (equity price index – LEQ) and interest rates (deposit interest rates – LINT). The following Eqs. (1) and (2) show the bivariate relationship between stock prices and interest rates:
This figure calculates that the given lEQ is the stock price (equity price index), and LINT_{t}is the deposits’ interest rates in the banking sector. In the above equations, L represents the natural logarithm of the variables, and the beta coefficients depict the longrun elasticities. εt represents the white noise error term of the equations.
Methods
The empirical analysis in a time series usually begins with an investigation of the variables’ order of integration by applying the unit root tests. This study uses the Perron (Perron, 1989) breakpoint unit root test method to determine the order of integration.
Based on Tursoy and Faisal (Tursoy & Faisal, 2018), the conventional unit root test cannot identify evidence of the structural break. Also, Türsoy and Faisal (Türsoy & Faisal, 2018) using conventional and breakpoint unit root tests to determine the correct order of integration. Perron (Perron, 1989) proposes the breakpoint unit root test to allow for the break in the unit root test. Perron (Perron, 1989) states that breakpoints and unit roots are related, and conventional unit root tests are biased when determining the correct order of integration. In this unit root test, there are two forms: the additive outlier (AO) model and the innovative outlier (IO) model, which observe the immediate and gradual shocks, respectively (Türsoy, 2017).
This study analyses the longrun and shortrun dynamics using the ARDL Bounds Test, developed by Pesaran et al. (Pesaran et al., 2001). The standard loglog functional specification represents the cointegration between stock prices and interest rates, as follows:
Where Δ is the first different operator, andυ1 t and υ2 t are the error terms. The error terms should be white noise. The Akaike Information Criterion (AIC) is used to select the lag length selection, and in the ARDL model, the null hypothesis of no cointegration between two variables is examined via the Fstatistic.
The estimated Fstatistic is usually compared with the two critical values (upperbound and lowerbound). Theoretically, the null hypothesis of no cointegration is rejected by the condition of the Fstatistic being higher than the critical values. If the estimated statistic lies between the two bounds, the decision is rendered inconclusive. Lastly, if the estimated statistic is below both bounds, the null hypothesis of no cointegration is accepted, and it concludes that there is no cointegration.
Specifically, by the estimation, it is understood that the Fstatistic should be higher than the upperbound critical values in order to find the cointegration between the concerned variables. In the ARDL framework, a mixed order of integration among the regressors is admissible for estimating the necessary statistic to determine the cointegration.
Usually, this feature is advantageous for applying the cointegration with I(0) and I(1) variables in the system of equations of the ARDL Bounds Test. When the cointegration is calculating with the Fstatistic, it can proceed to investigate the shortrun (Eqs. 5 and 6) coefficients.
In Eqs. 5 and 6, the error term, which represents the speed of adjustment to converge back to the longrun equilibrium, is ECTt−1. This term should be negative and also needs to be between 0 and 1. Likewise, the longrun elasticities among the predetermined, cointegrated variables are analyzed via the single vectors with fully modified OLS (FMOLS) as proposed by Philips and Hansen (Phillips & Hansen, 1990), the dynamic OLS (DOLS) technique as suggested by Stock and Watson (Stock & Watson, 1993), and the Canonical Cointegrating Regression (CCR).
The single cointegrating equations are applied to the unique order of series to provide evidence of a longrun relationship. The robustness of the findings in the ARDL cointegration is supported by the FMOLS, DOLS, and CCR to estimate the longrun elasticities for the concerned relationship for the two variables. Moreover, the cointegration between stock prices and interest rates are examined again through the Vector Autoregressive Model (VAR), which was proposed by Johansen (Johansen, 1991; Johansen, 1995) in order to scrutinize the relationship between the variables. Also, the shortrun innovation accounting techniques (impulse response and variance decomposition) are applied to investigate the shortrun shock between them.
Empirical results
As explained in the prior section, the first stage determines the order of integration of the series. In this study, the Perron (Perron, 1989) breakpoint unit root test is employed to estimate the stationarity of the variables. Table 1 represents the outcomes of the unit root test with a structural break in the variables.
The Perron (Perron, 1989) unit root test allows one break point. This method has two models: an AO and an IO. Both models’ results are reported in the above table, and both variables are non stationary at level and stationary at first difference. As a result, the variables have the same order of integration, which is I(1).
After the first estimation determining the order of integration of the variables, it is possible to proceed to the cointegration analysis in both the ARDL Bounds and VAR frameworks.
For the ARDL Bounds, Eq. 3 and Eq. 4 can be applied to explore the cointegration between the two variables. Table 2 reports the estimated Fstatistic for both equations. The second row provides evidence that both models are cointegrated and a longrun relationship exists between the two variables.
For example, the estimated Fstatistic for the model of F_{lnEQ} (LnEQ/LnINT) is 8.649, and above the upper bound critical values for 5%. According to the second model of F_{lnEQ} (LnINT/LnEQ), the estimated statistic is 11.098 and lies above the upper boundary critical values at 1%. Estimation of the shortrun dynamics is shown in the same table.
The models for Eq. 5 and Eq. 6 are included with the error correction terms. These coefficients represent the speed of adjustment of the shortterm disequilibrium to the longterm equilibrium. The results of the error correction terms are also presented in Table 2. In Model 1, the speed of adjustment is close to 9%, whereas for the second, it is approximately 7%. Both coefficients are significant at 1% and negative, which provides data for the shortrun dynamics. With these coefficients, it is evident that both variables affect each other. This implies that each variable converges to its longrun equilibrium, with its speed of adjustment in one period, by channeling with the other variable.
After evidence is provided for cointegrating vectors among the variables for both models, the next step is to estimate the longrun elasticities with the FMOLS, DOLS, and CCR cointegration equations. These cointegration equation results are reported in Tables 3 and 4 for the variables, which are I(1).
The cointegration equations are applied to the variables, which are nonstationary at level and stationary at first difference. The longrun elasticities are estimated differently by Panel A (Table 3) and Panel B (Table 4).
In Table 3, stock prices are used as the regress, and interest rates are used as the regressors. The findings show that a 1% increase in interest rates causes a decrease of 1.40% in stock prices, based on the FMOLS equations.
The results of DOLS and CCR provide the same evidence for a negative, significant impact on stock prices. All three methods provide approximately the same outcomes, which testify to the negative effect of interest rates on stock prices. In the matter of the initial theory, explained at the beginning of this paper, the adverse effect can be observed in Table 3.
Similar to the above explanation, in the case where the interest rate is the regress and stock price is the regressor, a 1% increase in stock price will cause interest rates to fall by approximately 0.6%.
The negative and significant signs of both variables correlate to the findings of Huang et al. (Huang et al., 2016), which imply that the U.S. stock market responds negatively to interest rates. Furthermore, Assefa et al. (Assefa et al., 2017) find statistically significant, negative effects of interest rates on stock returns in developed countries. These negative effects on stock returns are consistent with the expected cash flow hypothesis.
Nasseh and Strauss (Nasseh & Strauss, 2000) reveal a strong, integrating relationship between stock prices and domestic and international macroeconomic variables in developed countries. Specifically, longterm interest rates are shown to negatively influence stock prices, which is consistent with their role as a discount factor.
In the interest of checking the robustness of the above evidence, the Johansen Cointegration test is applied to verify the existing cointegrating equation. Like the ARDL and cointegrating equations, the Johansen cointegration results produce the same evidence for one cointegrating vector.
Table 5 represents the Trace and MaxEigen statistics. The Johansen test outcomes demonstrate cointegration between the stock price and interest rates, which confirm the results of the ARDL Bounds Test. The critical values for both statistics reject the null hypothesis of at most, one cointegrating vector at the 5% level.
Like FMOLS and others, the Johansen test records similar coefficients for the concerned relationship. The cointegration equations provide coefficients whose signs are negative for both variables. This data also corroborates the negative relationship between the variables. Thus, both variables are moving in opposite directions. These findings support the view that investors are segmented in each market, which signifies that they either choose the stock market or the interest rate market.
Enders (Enders, 2004) explains that with economic data, it is not always clear that one variable is
dependent and that the others are independent. Using vector autoregression is appropriate because
it treats all variables as jointly endogenous. Each variable can depend on its own past values and on the past values of all other variables in the system.
Enders (Enders, 2004) also states that, for each variable in the system, innovation accounting techniques (impulse response and variance decomposition) can be used to ascertain:
(i) the percentage of the forecast error variance attributable to each of the other variables, and.
(ii) the impulse responses to the various innovations.
These techniques are applied to examine the relationship between stock prices and interest rates.
Figure 2 displays the impulse response of each variable to itself and to the others. The response of stock prices to the shocks from interest rates is significant at Period 7, and its shocks give a negative response from interest rates. For the case of interest rates, stock price shocks have an immediate effect on interest rates, which is significant and negative until Period 4. The negative shocks from stock prices to interest rates immediately occur and die at period 4. Both responses demonstrate that each variable shows a negative response to each other.
Although the impulse response function and variance decomposition offer similar information, the variance decomposition illustrates another technique for examining VAR system dynamics.
The variance decomposition gives the proportion of the movements in dependent variables, which are the result of their own shocks and the other variables’ shocks. The variance decomposition determines how much of the nstepahead forecast error variance of a given variable is explained through innovations of each variable.
Figure 3 illustrates the variance decompositions of the stock prices and interest rates. As is immediately apparent, almost all forecast error variances of the stock price are explained by their own innovation. The outcome is consistent with the result obtained from the impulse response analysis, which reveals that its innovation produces a significant response of stock prices to the shock.
Nevertheless, after Period 7, the variance decomposition of stock price demonstrates that interest rate shocks account for approximately 9% of the forecast error variance of the stock price. Similarly, the variance decomposition of interest rates shows that the stock price shocks accounted for approximately 13% of the forecast error variance of the interest rates, and the remaining proportion is accounted for by its own innovation.
The analytical interpretation concludes that stock price is responsible for movements in interest rates and vice versa. This conclusion verifies the findings obtained from the impulse response function.
Concluding remarks
The Central Bank normally establishes benchmark interest rates for market participants and institutions, thereby providing an indication for them to assist in determining their profits and losses.
After Turkey started to liberalize its financial markets, as well as other countries, they deregulated their interest rates to follow free market dynamics. Supply and demand determines the interest rates in markets, and all institutions are free to engage with their own interest rates. Therefore, like stock prices, which are determined by the market participants, interest rates also show the same comovements and dynamics.
The purpose of this study is to explore the interaction between two prices (stock and interest rates) via the ARDL Bounds and VAR cointegration techniques, cointegration equations, and innovation accounting techniques. The study obtains monthly data from the IFS database, covering the period from January 2001 to April 2017. This empirical evidence indicates a significant and longrun relationship between stock price and interest rates. Specifically, interest rates have a negative effect on stock prices in Turkey, which is consistent with the expected cash flow hypothesis. At the same time, stock prices negatively impact interest rates. This is explained by the effect of monetary policy implications on the financial market due to the rate targeting program.
With this program, interest rates are reduced substantially, while stock market investments increase significantly in Turkey’s financial markets. Based on the findings, in order to improve financial market investments in stock prices, it is necessary to change the interest rates. If authorities continue the inflationtargeting program in Turkey to reduce rates in the financial markets, this will likely improve investments in the stock market.
Abbreviations
 AIC:

Akaike information criterion
 AO:

Additive outlier
 ARDL:

Autoregressive distributed lag
 CCR:

Canonical cointegrating regression
 DOLS:

Dynamic ordinary least squared
 ECM:

Error correction model
 ECT:

Error correction term
 FMOLS:

Fully modified ordinary least squared
 IFS:

International financial statistics
 IO:

Innovative outlier
 VAR:

Vector autoregressive
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I’m greatly thankful to the Editor and the anonymous referees for their most valuable suggestions that improved early version of the manuscript.
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The data for the variables of this study were collected from the International Financial Statistics (IFS).
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Correspondence to Turgut Tursoy.
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Keywords
 Stock price
 Interest rates
 Cointegration
 ARDL
 VAR
Jel classifications
 G11
 G12
 C22