Several studies have found a negative relationship between the level of collective bargaining centralization and the degree of wage inequality. So, more centralized bargaining seems to lead to lower wage gaps. On the other hand, there is evidence that the gender wage gap increases as we move upwards along the wage distribution, illustrating the glass ceiling hypothesis. In this paper we study how the wage gap changes throughout the distribution of wages, as a function of the level of collective bargaining by which workers are covered, using data from the Spanish Wage Structure Survey of 2002.
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