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Margin requirements with intraday dynamics

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  • John Cotter
  • François Longin

Abstract

Both in practice and in the academic literature, models for setting margin requirements in futures markets use daily closing price changes. However, financial markets have recently shown high intraday volatility, which could bring more risk than expected. Such a phenomenon is well documented in the literature on high-frequency data and has prompted some exchanges to set intraday margin requirements and ask intraday margin calls. This article proposes to set margin requirements by taking into account the intraday dynamics of market prices. Daily margin levels are obtained in two ways: first, by using daily price changes defined with different time-intervals (say from 3 pm to 3 pm on the following trading day instead of traditional closing times); second, by using 5-minute and 1-hour price changes and scaling the results to one day. An application to the FTSE 100 futures contract traded on LIFFE demonstrates the usefulness of this new approach.

Suggested Citation

  • John Cotter & François Longin, 2004. "Margin requirements with intraday dynamics," Centre for Financial Markets Working Papers 10197/1162, Research Repository, University College Dublin.
    • Handle: RePEc:rru:cfmwps:10197/1162
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    File URL: http://hdl.handle.net/10197/1162
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    Cited by:

    1. is not listed on IDEAS
    2. John Cotter, 2005. "Uncovering long memory in high frequency UK futures," The European Journal of Finance, Taylor & Francis Journals, vol. 11(4), pages 325-337.

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    JEL classification:

    • G15 - Financial Economics - - General Financial Markets - - - International Financial Markets

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