Abstract Using the data from an original survey on rural migrant workers from Suzhou industrial sector in 2013, we estimate the wage effect of both union membership and union coverage across the wage distributions using decomposition approach based on unconditional quantile regression. The results show that union membership has a significant effect on the wage level of rural migrant workers across the wage distribution. The effect of coefficient differences which results from the different rewarding systems explains the majority wage differentials between union members and non-members in non-unionized firms. There is also significant union coverage effect at the lower part of the distribution when comparing the union-covered non-member to the nonunion-covered non-member, which is also mainly caused by the coefficient effect. By contrast, wage differentials between union members and non-members in unionized firms are attributed to significant composition effect, which reveals that union members are positively selected within unionized firms. As a result, the positive wage effect of union is limited to the more advantaged group among migrant workers.

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工会会员，工会覆盖率和农民工的工资分散：苏州工业部门的证据

摘要利用2013年对苏州工业部门农民工的原始调查数据，我们采用基于无条件分位数回归的分解方法，估计了工会会员资格和工会覆盖率在整个工资分配中的工资效应。结果表明，工会成员资格对整个工资分配过程中的农民工工资水平有显着影响。由不同的奖励制度引起的系数差异的影响解释了在非工会组织中工会成员与非成员之间的多数工资差异。当比较工会覆盖的非成员与工会覆盖的非成员时，在分布的下部还存在显着的工会覆盖效应，这也主要是由系数效应引起的。相比之下，工会成员中工会成员与非成员之间的工资差异归因于显着的构成效应，这表明工会成员在工会组织中被积极选择。结果，工会的积极工资效应仅限于农民工中处于较有利地位的群体。