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Optimal margin requirement

Author

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  • Berlinger, Edina
  • Dömötör, Barbara
  • Illés, Ferenc

Abstract

We investigate the optimal level of margin requirement in centralized or decentralized clearing and settlement systems. We prove in an analytical model that aggressively risk-sensitive margins are not optimal, and the actual position of the clients and the general macroeconomic conditions, like overall funding liquidity should also be taken into consideration. For example, in a crisis period characterized by high volatility, the clearing institution may be tempted to require larger margins to cover potential losses, however, clients just have difficulties to finance higher margins, hence, the probability of non-payment increases, and the expected loss of the clearing institution may also increase. We show that under realistic specifications, there exists a unique optimal margin minimizing the expected loss of the clearing institution. Characterizing this optimum, we provide a micro-level foundation for anti-cyclical risk management techniques (margins, collaterals, haircuts etc.) in general.

Suggested Citation

  • Berlinger, Edina & Dömötör, Barbara & Illés, Ferenc, 2019. "Optimal margin requirement," Finance Research Letters, Elsevier, vol. 31(C).
    • Handle: RePEc:eee:finlet:v:31:y:2019:i:c:s1544612318307165
    DOI: 10.1016/j.frl.2018.11.010
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    References listed on IDEAS

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    1. Brennan, Michael J., 1986. "A theory of price limits in futures markets," Journal of Financial Economics, Elsevier, vol. 16(2), pages 213-233, June.
    2. Benos, Evangelos & Garratt, Rodney & Gurrola-Perez, Pedro, 2017. "The economics of distributed ledger technology for securities settlement," Bank of England working papers 670, Bank of England.
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    Cited by:

    1. Friesz, Melinda & Váradi, Kata, 2023. "Your skin or mine: Ensuring the viability of a central counterparty," Emerging Markets Review, Elsevier, vol. 57(C).
    2. Dávid Zoltán Szabó & Kata Váradi, 2022. "Margin requirements based on a stochastic correlation model," Journal of Futures Markets, John Wiley & Sons, Ltd., vol. 42(10), pages 1797-1820, October.
    3. Berlinger, Edina & Bihary, Zsolt & Dömötör, Barbara, 2024. "Dynamic margin optimization," Finance Research Letters, Elsevier, vol. 68(C).
    4. Melinda Friesz & Kira Muratov-Szabó & Andrea Prepuk & Kata Váradi, 2021. "Risk Mutualization in Central Clearing: An Answer to the Cross-Guarantee Phenomenon from the Financial Stability Viewpoint," Risks, MDPI, vol. 9(8), pages 1-19, August.

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