A Simple Treatment of the Liquidity Trap for Intermediate Macroeconomics Courses

Sebastien Buttet and Udayan Roy ()

The Journal of Economic Education, 2014, vol. 45, issue 1, 36-55

Abstract: Several leading undergraduate intermediate macroeconomics textbooks now include a simple reduced-form New Keynesian model of short-run dynamics (alongside the IS-LM model). Unfortunately, there is no accompanying description of how the zero lower bound on nominal interest rates affects the model. In this article, the authors show how the aforementioned model can easily be modified to teach undergraduate students about the significance of the zero lower bound for economic performance and policy. This acquires additional significance because economies such as the United States and Japan have been close to the zero lower bound since 2008 and 1995, respectively. The authors show that when the zero lower bound is introduced, an additional long-run equilibrium exists. This equilibrium is unstable and can lead to a deflationary spiral.

Date: 2014
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DOI: 10.1080/00220485.2014.859959

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