| Variables | (1) | (2) | (3) | (4) |
|---|---|---|---|---|
| CL | POLY | IS | POLY | |
| ADA | 0.2401*** (0.0698) | 0.0057* (0.0032) | 0.0838** (0.0387) | 0.0061* (0.0035) |
| CL | -0.0025* (0.0014) | |||
| IS | 0.0074*** (0.0024) | |||
| Control variable | Yes | Yes | Yes | Yes |
| Year FE | Yes | Yes | Yes | Yes |
| City FE | Yes | Yes | Yes | Yes |
| R2 | 0.0031 | 0.0209 | 0.0008 | 0.0108 |
| Observations | 1644 | 1644 | 1644 | 1644 |
Figure 2 The geographic location of cities that implemented administrative division adjustment between 2013 and 2018
Figure 4 The spatiotemporal evolution of urban polycentricity in China in different years: (a) 2013, (b) 2014, (c) 2015, (d) 2016, (e) 2017 and (f) 2018