Abstract :The main purpose of the minimum wage regulation is to guarantee the living standard of low-wage workers, but economists have no consensus on the wage effect of the minimum wages.We argue that the difference between the short-run and long-run effects of the minimum wages on wages is an important reason for the disagreement.Based on the Dynamic Monitoring Survey of National Migrant Population data,this paper investigates the short-run and long-run effects of minimum wages on rural migrant workers' wages using dynamic "difference in difference" method.Triple difference model and repeated cross-sectional model are applied for the robustness test.Results show that the wage effect of minimum wages has a significant dynamic feature.The increase of minimum wages has a significant positive impact on rural migrant workers' wages in the short-run, but the positive impact gradually declines with time and becomes insignificant in the long-run. Through the analysis by different occupations,age groups,and skills groups,we find that the impact on wages is more significant and last longer when the initial wages level of migrant workers is low.Through the analysis by provinces,we find that the wage effects are larger and last longer when the increasing range of the minimum wages is large.Therefore,the government should fully consider the dynamic feature of the minimum wages' effects and ensure the adjustment frequency of the minimum wage standard,which will contribute to increasing migrant workers' wages consistently.

Key words: Minimum Wage Standard;Wage;Rural Migrant Workers;Dynamic Difference in Difference model