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Title: A Model of the Twin Ds: Optimal Default and Devaluation

Author(s): Seunghoon Na, Stephanie Schmitt-Grohé, Martín Uribe and Vivian Yue

Publication Date: July 2015

Keyword(s): capital controls, currency pegs, downward nominal wage rigidity, exchange rates, optimal monetary policy and sovereign default

Programme Area(s): International Macroeconomics and Finance and Monetary Economics and Fluctuations

Abstract: This paper characterizes jointly optimal default and exchange-rate policy in a small open economy with limited enforcement of debt contracts and downward nominal wage rigidity. Under optimal policy, default occurs during contractions and is accompanied by large devaluations. The latter inflate away real wages thereby avoiding massive unemployment. Thus, the Twin Ds phenomenon emerges endogenously as the optimal outcome. By contrast, under fixed exchange rates, optimal default takes place in the context of large involuntary unemployment. Fixed-exchange-rate economies are shown to have stronger default incentives and therefore support less external debt than economies with optimally floating rates.

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Bibliographic Reference

Na, S, Schmitt-Grohé, S, Uribe, M and Yue, V. 2015. 'A Model of the Twin Ds: Optimal Default and Devaluation'. London, Centre for Economic Policy Research. https://cepr.org/active/publications/discussion_papers/dp.php?dpno=10697