NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

Kevin Proulx

Brown University
Economics Department
Robinson Hall
64 Waterman Street
Providence, RI 02912

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NBER Working Papers and Publications

May 2016Bernanke's No-arbitrage Argument Revisited: Can Open Market Operations in Real Assets Eliminate the Liquidity Trap?
with Gauti B. Eggertsson: w22243
We first show that, at least in theory, open market operations in real assets can be a useful tool for overcoming a liquidity trap because they change the inflation incentives of the government, and thus change private sector expectations from deflationary to inflationary. We argue that this formalizes Ben Bernanke's arbitrage argument for why a central bank can always increase nominal demand, despite the zero lower bound. We illustrate this logic in a calibrated New Keynesian model assuming the government acts under discretion. Numerical experiments suggest, however, that the needed intervention is incredibly high, creating a serious limitation of this solution to the liquidity trap. Our experiments suggest that while asset purchases can be a helpful commitment device in theory, they may ...
 
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