| 类型 | Lnsir | Lnssr | ||
| (1) | (2) | (3) | (4) | |
| Fe | GMM | Fe | GMM | |
| 基准面板 | 0.187*** | 0.100** | 0.188*** | 0.090** |
| (0.040) | (0.047) | (0.040) | (0.046) | |
| 平衡面板 | 0.204*** | 0.107** | 0.205*** | 0.095* |
| (0.044) | (0.048) | (0.044) | (0.047) | |
| 剔除2019年数据 | 0.187*** | 0.153*** | 0.187*** | 0.142*** |
| (0.046) | (0.097) | (0.046) | (0.096) | |