Margin Changes and Futures Trading Activity: a New Approach

Kate Phylaktis and Antonis Aristidou

European Financial Management, 2013, vol. 19, issue 1, 45-71

Abstract: In this paper we examine the impact of margins, adjusted for underlying price risk proxied by market volatility, on trading volume and incorporate the relationship between trading volume and price volatility documented in stock markets. We estimate a bivariate GARCH†M model to take account of the inter†relationships and apply them to the Greek derivatives market over the period 1999–2005. The results show that when adjusting margins for market risk there is no impact on trading volume, casting doubts on the results of previous research, and providing support for the view that margin requirements are used only as a mechanism to prevent trader default.

Date: 2013
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