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Securitized banking, procyclical bank leverage, and financial instability

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  • Park, Hyun Woong

Abstract

This paper provides a theoretical explanation of procyclical leverage of the broker-dealer sector and examines its macroeconomic consequences within the context of the securitized banking system characterized by loan securitization and collateralized short-term borrowing. First, from a model of repo transaction, it is shown that a broker–dealer (repo borrower)'s optimal leverage is positively related to asset prices. The main mechanism underlying this relation is a movement of repo rate, which reflects counter-party risks and collateral value risks repo lenders are facing. Second, based on this result, I develop a macroeconomic model with a securitized banking system characterized by procyclical bank leverage and identify conditions under which the model exhibits a limit cycle behavior. A vulnerability of the repo market to asset price fluctuations leads to procyclical bank leverage, which aggravates asset price cycles driven by the supply-led credit expansion and collapse. It is also found that as the procyclicality of bank leverage becomes stronger the financial cycles also get more intense and severe.

Suggested Citation

  • Park, Hyun Woong, 2019. "Securitized banking, procyclical bank leverage, and financial instability," Structural Change and Economic Dynamics, Elsevier, vol. 49(C), pages 283-300.
    • Handle: RePEc:eee:streco:v:49:y:2019:i:c:p:283-300
    DOI: 10.1016/j.strueco.2018.10.001
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    Keywords

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    JEL classification:

    • E32 - Macroeconomics and Monetary Economics - - Prices, Business Fluctuations, and Cycles - - - Business Fluctuations; Cycles
    • 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
    • G21 - Financial Economics - - Financial Institutions and Services - - - Banks; Other Depository Institutions; Micro Finance Institutions; Mortgages
    • G24 - Financial Economics - - Financial Institutions and Services - - - Investment Banking; Venture Capital; Brokerage

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