Abstract
New Keynesian DSGE models assume a constant degree of wage indexation to past inflation, neglecting empirical and institutional evidence of a time-varying degree. We build a DSGE model with utility-maximizing workers that can endogenously choose the wage indexation rule. We find that workers index their wage to past inflation when shocks to productivity and the nominal anchor drive output fluctuations. By contrast, they index wages to the inflation target when aggregate demand shocks dominate. We further show that this decentralized equilibrium is not socially optimal, but explains the time-varying degree of wage indexation in US data very well.
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