| 变量 | GTI | GTI | GTI | GTI | 
| (1) | (2) | (3) | (4) | |
| treat × post | -0.209*** (0.0650) | -0.235*** (0.0706) | -0.669 (0.574) | -0.641 (0.628) | 
| Sub × treat | 
 | 
 | -0.0122 (0.00760) | -0.0170** (0.00859) | 
| Sub × treat × post | 
 | 
 | 0.0403 (0.0376) | 0.0420 (0.0411) | 
| Sub × post | 
 | 
 | -0.0266 (0.0467) | -0.0228 (0.0500) | 
| Sub | 
 | 
 | 0.0927*** (0.0333) | 0.0534 (0.0342) | 
| Growth | 
 | 0.198** (0.0263) | 
 | 0.0751*** (0.0268) | 
| Lev | 
 | 0.244* (0.132) | 
 | 0.258* (0.133) | 
| Ros | 
 | -0.380** (0.191) | 
 | -0.293* (0.178) | 
| size | 
 | 0.149*** (0.0326) | 
 | 0.103*** (0.0373) | 
| age | 
 | -0.122*** (0.0281) | 
 | -0.107*** (0.0286) | 
| TobinQ | 
 | 0.0810*** (0.0263) | 
 | 0.0751*** (0.0268) | 
| 企业 | 控制 | 控制 | 控制 | 控制 | 
| 年度 | 控制 | 控制 | 控制 | 控制 | 
| 样本量 | 4400 | 4400 | 4400 | 4400 | 
| 调整R2 | 0.005 | 0.033 | 0.019 | 0.035 |