Controlling for endogeneity of strike variables in the estimation of wage settlement equations

This article analyzes wage changes with an unbalanced panel from the Spanis h Collective Bargaining in Large Firms survey. Central to the analysis are the joint determination of strike and wage outcomes and, in particular, the estimation of the slope of the wage concession curve. I control for the po ssible endogeneity of strike variables in the wage equation and suggest two sets of instruments: lagged strike outcomes or reduced-form predictions of the strike variables. When controlling for endogeneity, a negative relatio nship between strike duration and the size of the wage change arises. Howev er, short strikes still produce higher wage changes.