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| Variable | Variable definition |
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| InvestEff | Investment efficiency = residual of Richardson regression |
| UnderInvest | Underinvestment = residual with Richardson regression being less than 0 |
| OverInvest | Overinvestment = residual with Richardson regression being more than 0 |
| khRisk | Customer risk = customer ROA volatility |
| Size | Supplier enterprise scale = natural logarithm of total assets |
| Lev | Supplier asset-liability ratio = liabilities/total assets |
| Cash | Holding amount of supplier’s monetary capital = monetary capitals/total assets |
| Age | Natural logarithm of supplier’s listing years |
| Ocf | Cash flow from supplier’s operating activities = net cash flow from operating activities/total assets |
| Tac | Supplier’s total asset turnover ratio = operating revenues/total assets |
| Share | Supplier equity balance degree = natural log of the sum of squares of shareholding ratios of the second to the tenth largest shareholders |
| ROA | Return rate of supplier’s total assets = net profits/total assets |
| CusConcen | Supplier customer concentration, and proportion of sales revenue of the largest customer in the total sales revenue |
| Gysnstata | Nature of property right of the supplier. The assignment will be 1 in case of being a state-owned enterprise or will be 0 if not |
| khSize | Customer enterprise scale = natural logarithm of total assets |
| khLev | Asset-liability ratio of customer enterprise = liabilities/total assets |
| khAge | Natural logarithm of customer enterprise’s listing years |
| khOcf | Cash flow from customer’s operating activities = net cash flow from operating activities/total assets |
| khnstata | Nature of property right of the customer. The assignment will be 1 in case of being a state-owned enterprise or will be 0 if not |
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