What are the current laws regarding wage increase in China?

According to China's Employment Promotion Plan, the minimum wage in each jurisdiction in China must be increased at least once every two years; meanwhile, the 2011-15 Five-year Plan stipulates an average increase of 13 percent per year. 

As of June 2014, wages have been hiked in a total of eleven areas--Beijing, Chongqing, Gansu, Guangdong (Shenzhen), Qinghai, Shaanxi, Shandong, Shanxi, Shanghai, Tianjin and Yunnan--at an average of 11 percent for monthly minimum wage increases. Most recently, an additional wage increase for Sichuan took effect on July 1 2014.

Wages will also be increased in Hebei, Heilongjiang and Tibet before the year is up. If this trend continues through the remainder of 2014, some 26 regions may be on track for increases to their minimum wage.