| Variables | (1) | (2) | (3) | (4) | (5) |
|---|---|---|---|---|---|
| ADA | 0.0056* (0.0032) | 0.0060* (0.0032) | 0.0062* (0.0037) | 0.0062* (0.0036) | 0.0059* (0.0032) |
| W ADA | 0.1185** (0.0506) | 0.1552*** (0.0598) | 0.1383** (0.0595) | 0.1558*** (0.0573) | 0.1359** (0.0596) |
| Control variable | Yes | Yes | Yes | Yes | Yes |
| Year FE | Yes | Yes | Yes | Yes | Yes |
| City FE | Yes | Yes | Yes | Yes | Yes |
| R2 | 0.0123 | 0.0119 | 0.0086 | 0.0112 | 0.0094 |
| Observations | 1644 | 1620 | 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