Table 14 Firm productivity (measured by ratio of operating revenue of the year to number of employees at the end of the year) divided by High and Low Supplier Concentration Groups
From: Does supplier concentration matter to investors during the COVID-19 crisis: evidence from China?
Mean of the ratio of operating revenue of the year to number of employees at the end of the year ( unit for operating revenue: CNY1 million) | ||||
|---|---|---|---|---|
2016 | 2017 | 2018 | 2019 | |
Low concentration group | 0.643 | 0.708 | 0.776 | 0.818 |
High concentration group | 0.678 | 0.737 | 0.785 | 0.859 |
Two-sample t- test | − 0.035 (1.55) | − 0.029 (0.49) | − 0.009 (0.827) | − 0.041(0.184) |