Fig. 4

Enforcement of the minimum wage across provinces, 2002–2009. The vertical axis shows enforcement, which is defined as the number of minimum wage workers divided by the number of workers earning less than the minimum wage. Minimum wage workers earn wages between the exact minimum wage and 1.1 times the minimum wage. The East includes Liaoning, Beijing, Shandong, Jiangsu, Shanghai, and Guangdong; the Central region includes Heilongjiang, Shanxi, Henan, Anhui, Hubei, and Jiangxi; and the West includes Gansu, Chongqing, Sichuan, and Yunnan