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A Model of QE, Reserve Demand, and the Money Multiplier

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  • ELLEN RYAN
  • KARL WHELAN
Abstract
Quantitative easing (QE) programs have driven unprecedented expansions in the supply of central bank reserves around the world over the past two decades, fundamentally changing the implementation of monetary policy. The collapse in money multipliers following QE episodes has often been interpreted as implying banks are happy to passively hold most of the reserves created by QE. This paper develops a simple microsimulation model of the banking sector that adapts the traditional money multiplier model and allows for bank reserve demand to be inferred from monetary aggregates. The model allows the use of unwanted reserves by banks to play out over time alongside QE purchases and incorporates both significantly higher reserve demand after 2008 and capital constraints. With these additions, the model explains the persistently lower money multipliers seen in the United States following QE, as well as the growth in commercial bank deposits. The model suggests the demand from banks for reserves has increased substantially since the introduction of QE but not to the point where banks are passively absorbing all newly created reserves.

Suggested Citation

  • Ellen Ryan & Karl Whelan, 2023. "A Model of QE, Reserve Demand, and the Money Multiplier," Journal of Money, Credit and Banking, Blackwell Publishing, vol. 55(2-3), pages 407-439, March.
    • Handle: RePEc:wly:jmoncb:v:55:y:2023:i:2-3:p:407-439
    DOI: 10.1111/jmcb.12975
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    1. Albertus Prabu Siagian, 2023. "A Mathematical Approach to the Money Multiplier Analysis on Indonesian 1997–1998 Monetary Crisis," Economics and Finance in Indonesia, Faculty of Economics and Business, University of Indonesia, vol. 69, pages 47-66, Juni.

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    More about this item

    JEL classification:

    • E51 - Macroeconomics and Monetary Economics - - Monetary Policy, Central Banking, and the Supply of Money and Credit - - - Money Supply; Credit; Money Multipliers
    • E52 - Macroeconomics and Monetary Economics - - Monetary Policy, Central Banking, and the Supply of Money and Credit - - - Monetary Policy
    • E58 - Macroeconomics and Monetary Economics - - Monetary Policy, Central Banking, and the Supply of Money and Credit - - - Central Banks and Their Policies

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