Exports and wage-premia: Evidence from Mexican employer-employee data

This paper draws on a new combination of employer-employee and plant-level data from Mexico to investigate the relationship between exports and wage premia, defined as wages above what workers would receive elsewhere in the labor market. We first use detailed information on indi-vidual workers ’ wage histories to decompose plant-level average wages into a component reflecting skill composition and a component reflecting wage premia. Our estimating procedure allows for changes in the return to ability and feedback from current idiosyncratic shocks to future mobility. We then use the peso devaluation of late 1994, which we argue generated an exogenous differen-tial inducement to export within industries, to estimate the effect of export incentives on the two components. Comparing across plants within industries, we find that approximately two-thirds of the higher level of wages in larger, more productive plants is explained by higher levels of wage premia, and that nearly all of the differential within-industry wage change due to the export shock is explained by changes in wage premia. The findings argue against the hypothesis that sorting on individual ability is solely responsible for the plant-level wage changes