We study Ramsey policies and optimal monetary policy rules in a dynamic New Keynesian model with unionized labor markets. Collective wage bargaining and unions' monopoly power amplify inefficient employment fluctuations. The optimal monetary policy must trade off between stabilizing inflation and reducing inefficient unemployment fluctuations induced by unions' monopoly power. In this context the monetary authority uses inflation as a tax on union rents and as a mean for indirect redistribution. Results are robust to the introduction of imperfect insurance on income shocks. The optimal monetary policy rule targets unemployment alongside inflation. ( JEL E0, E4, E5, E6)
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Faia et al. (2012) studied this question.
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