NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

Currency Wars or Efficient Spillovers? A General Theory of International Policy Cooperation

Anton Korinek

NBER Working Paper No. 23004
Issued in December 2016
NBER Program(s):Economic Fluctuations and Growth, International Finance and Macroeconomics, International Trade and Investment, Monetary Economics, Technical Working Papers

In an interconnected world, national economic policies regularly lead to large international spillover effects, which frequently trigger calls for international policy cooperation. However, the premise of successful cooperation is that there is a Pareto inefficiency, i.e. if there is scope to make some nations better off without hurting others. This paper presents a first welfare theorem for open economies that defines an efficient benchmark and spells out the conditions that need to be violated to generate inefficiency and scope for cooperation. These are: (i) policymakers act competitively in the international market, (ii) policymakers have sufficient external policy instruments and (iii) international markets are free of imperfections. Our theorem holds even if each economy suffers from a wide range of domestic market imperfections and targeting problems. We provide examples of current account intervention, monetary policy, fiscal policy, macroprudential policy/capital controls, and exchange rate management and show that the resulting spillovers are consistent with Pareto efficiency, but only if the three conditions are satisfied. Furthermore, we develop general guidelines for how policy cooperation can improve welfare when the conditions are violated.

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Document Object Identifier (DOI): 10.3386/w23004

Published: Anton Korinek, 2017. "Currency Wars or Efficient Spillovers? A General Theory of International Policy Cooperation," IMF Working Papers, vol 17(25).

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