NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

The Natural Rate Hypothesis: An idea past its sell-by date

Roger E.A. Farmer

NBER Working Paper No. 19267
Issued in August 2013
NBER Program(s):   EFG

Central banks throughout the world predict inflation with new-Keynesian models where, after a shock, the unemployment rate returns to its so called “natural rate’. That assumption is called the Natural Rate Hypothesis (NRH). This paper reviews a body of work, published over the last decade, which is critical of the NRH. I argue that the NRH does not hold in the data and I provide an alternative paradigm that explains why it does not hold. I replace the NRH with the assumption that the animal spirits of investors are a fundamental of the economy and I show how to operationalize that idea by constructing an empirical model that outperforms the new-Keynesian Phillips curve. I model animal spirits with a new fundamental that I call the belief function.

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Document Object Identifier (DOI): 10.3386/w19267

Published: Farmer, Roger, 2013. "The Natural Rate Hypothesis: an idea past its sell-by date," Bank of England Quarterly Bulletin, Bank of England, vol. 53(3), pages 244-256.

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