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All that glitters: A theory of multiple bubbles with implications for cryptocurrencies

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  • Han, Jungsuk
  • Wang, Yenan

Abstract

We analyze a model of heterogeneous rational bubbles that compete and complement each other. When some bubbles burst, surviving ones gain value, offsetting losses from collapsed bubbles. This “compensation effect,” combined with diversification, enhances welfare. A portfolio of fragile bubbles may rival a single, stable bubble. The stationary equilibrium imposes a tight upper bound on bubble size, considering covariance structures, price fluctuations, and the emergence of new bubbles. These results have important policy implications, particularly for managing crypto ETFs and issuing CBDCs, highlighting the potential benefits of a diversified approach to fragile financial systems.

Suggested Citation

  • Han, Jungsuk & Wang, Yenan, 2025. "All that glitters: A theory of multiple bubbles with implications for cryptocurrencies," Journal of Monetary Economics, Elsevier, vol. 152(C).
    • Handle: RePEc:eee:moneco:v:152:y:2025:i:c:s0304393225000352
    DOI: 10.1016/j.jmoneco.2025.103764
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    JEL classification:

    • D53 - Microeconomics - - General Equilibrium and Disequilibrium - - - Financial Markets
    • E44 - Macroeconomics and Monetary Economics - - Money and Interest Rates - - - Financial Markets and the Macroeconomy
    • E51 - Macroeconomics and Monetary Economics - - Monetary Policy, Central Banking, and the Supply of Money and Credit - - - Money Supply; Credit; Money Multipliers
    • E58 - Macroeconomics and Monetary Economics - - Monetary Policy, Central Banking, and the Supply of Money and Credit - - - Central Banks and Their Policies
    • G01 - Financial Economics - - General - - - Financial Crises

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