"Trade Unions and the Welfare of Rural-Urban Migrant Workers in China", Booth, Alison L., Richard B. Freeman, Xin Meng and James Zhang. CEPR Discussion paper No. DP15350

Using a panel survey, we investigate how the welfare of rural-urban migrant workers in China is affected by trade union presence at the workplace. Controlling for individual fixed- effects, we find the following. Relative to workers from workplaces without union presence or with inactive unions, both union-covered non-members and union members in workplaces with active unions earn higher monthly income, are more likely to have a written contract, be covered by social insurances, receive fringe benefits, express work-related grievances through official channels, feel more satisfied with their lives, and are less likely to have mental health problems.