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Monetary Policy, Inflation, and Rational Asset Price Bubbles

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  • DAISUKE IKEDA

Abstract

Inflation has tended to be moderate during stock market booms in many countries. To explain the pattern and study optimal monetary policy in such a situation, this paper develops a dynamic model with rational bubbles and nominal rigidities. The model features a financial cost channel through which the shadow cost of borrowing affects marginal costs. A bubble‐led boom mitigates firms' borrowing constraints and keeps inflation from rising by decreasing the shadow cost. In this situation, Ramsey‐optimal monetary policy calls for tightening to curb the boom. Strict inflation targeting is counterproductive in the short run as it exacerbates the boom. For obtaining these results, the financial cost channel and nominal wage rigidity are essential.

Suggested Citation

  • Daisuke Ikeda, 2022. "Monetary Policy, Inflation, and Rational Asset Price Bubbles," Journal of Money, Credit and Banking, Blackwell Publishing, vol. 54(6), pages 1569-1603, September.
    • Handle: RePEc:wly:jmoncb:v:54:y:2022:i:6:p:1569-1603
    DOI: 10.1111/jmcb.12880
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    6. Jacopo Bonchi & Salvatore Nistico', 2023. "Optimal Monetary Policy and Rational Asset Bubbles," Working Papers 525, University of Milano-Bicocca, Department of Economics, revised Aug 2023.
    7. Dongxue Wang & Yugang He, 2024. "The Mathematical Simulation of South Korea’s Financial and Economic Impacts from Real Estate Bubbles: Lessons from the China Evergrande Collapse," Mathematics, MDPI, vol. 12(19), pages 1-24, September.

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