In addition, after studying the equilibrium action of regional economic disparity resulted from labor mobility between 1985 and 2000, Wang et al. (2003) believed that labor mobility promoted the increase of average GDP by about 1.5% and the decrease of GINI coefficient by about 1.6-7.5% in a number of provinces around 1990. At the end, Wang drew a conclusion that population mobility across provinces could effectively delay the increasing step of regional disparity in China.