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Some Reflections on the Theory of the “Liquidity Trap”

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Abstract
We provide a formal definition of the “liquidity trap” (LT) according to which, a LT arises if a combination of high precautionary saving, low investment and stringent conditions for access to bank credit stemming from a high degree of liquidity preference make the sum of the “neutral” interest rate and the expected inflation rate fall short of the term/risk premium on long-term interest rates. We then compare the “New Consensus” (NC) in macroeconomics as expounded in Woodford (2003) and the Post-Keynesian (PK) approach regarding the causes of a LT. We argue that in the NC approach a LT is a phenomenon caused by unusually large transitory shocks that depress the “neutral” interest rate temporarily. By contrast, we argue that in the PK approach an economy may also exhibit a “structural” or long-lasting LT even in the absence of large adverse shocks. Finally, we discuss a number of theoretical issues recently raised in the rapidly growing literature on the LT.

Suggested Citation

  • Alfonso Palacio Vera, 2009. "Some Reflections on the Theory of the “Liquidity Trap”," Documentos de trabajo de la Facultad de Ciencias Económicas y Empresariales 09-02, Universidad Complutense de Madrid, Facultad de Ciencias Económicas y Empresariales.
    • Handle: RePEc:ucm:doctra:09-02
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    More about this item

    Keywords

    Neutral interest rate; Liquidity trap; Liquidity preference; Credit rationing.;
    All these keywords.

    JEL classification:

    • B50 - Schools of Economic Thought and Methodology - - Current Heterodox Approaches - - - General
    • E12 - Macroeconomics and Monetary Economics - - General Aggregative Models - - - Keynes; Keynesian; Post-Keynesian; Modern Monetary Theory
    • E24 - Macroeconomics and Monetary Economics - - Consumption, Saving, Production, Employment, and Investment - - - Employment; Unemployment; Wages; Intergenerational Income Distribution; Aggregate Human Capital; Aggregate Labor Productivity
    • E50 - Macroeconomics and Monetary Economics - - Monetary Policy, Central Banking, and the Supply of Money and Credit - - - General

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