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State Dependent Effects of Monetary Policy: the Refinancing Channel -- by Martin Eichenbaum, Sergio Rebelo, Arlene Wong

This paper studies how the impact of monetary policy depends on the distribution of savings from refinancing mortgages. We show that the efficacy of monetary policy is state dependent, varying in a systematic way with the pool of potential savings from refinancing. We construct a quantitative dynamic lifecycle model that accounts for our findings. Motivated by the rapid expansion of Fintech, we study the impact of a fall in refinancing costs on the efficacy of monetary policy. Our model implies that as refinancing costs decline, the effects of monetary policy become less state dependent and more powerful.
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