| 变量 | GTI | GTI | GTI | GTI | 
| (1) | (2) | (3) | (4) | |
| treat × post | -0.291*** (0.101) | -0.316*** (0.104) | -2.272** (1.004) | -2.451** (1.519) | 
| Sub × treat | 
 | 
 | -0.0227* (0.0121) | -0.0303** (0.0136) | 
| Sub × treat × post | 
 | 
 | 0.148** (0.0629) | 0.164** (0.0679) | 
| Sub × post | 
 | 
 | -0.131*** (0.0711) | -0.137* (0.0789) | 
| Sub | 
 | 
 | 0.188*** (0.0464) | 0.120** (0.0524) | 
| Growth | 
 | 0.174 (0.131) | 
 | 0.210 (0.135) | 
| Lev | 
 | -0.0248 (0.241) | 
 | -0.0361 (0.242) | 
| Ros | 
 | -0.688*** (0.247) | 
 | -0.651*** (0.251) | 
| size | 
 | 0.300*** (0.0595) | 
 | 0.205*** (0.0662) | 
| age | 
 | -0.201*** (0.0496) | 
 | -0.152*** (0.0478) | 
| TobinQ | 
 | 0.132*** (0.0372) | 
 | 0.108*** (0.0359) | 
| 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 | 0.004 | 0.034 | 0.022 | 0.035 |