"This study demonstrates that intraday volume and return on LIFFE interest rate and currency futures exhibit an asymmetric volume-return relationship characterised by significantly larger volume associated with negative returns than with non-negative returns. This finding is unlike the stylised asymmetric relation often observed in equity markets, where the volume on price rise is larger than the volume on price decline. The asymmetric relationship in LIFFE futures is also found to be dynamic as the direction of asymmetry can reverse during the day. It has been argued in the past that a costly short sale restriction that requires a higher transaction cost on a short position than on a long position is responsible for the asymmetric effect in equity markets. Since such a restriction is absent in futures markets, they should not exhibit any asymmetric volume behaviour. Based on the results of this research, the costly short sale hypothesis is rejected. An alternative explanation of the asymmetric relation observed in futures is presented based on recent information models that take into consideration asymmetrically-informed traders, their dispersion of beliefs, quality and quantity of the information signal, and how the traders process it. The paper also confirms a strong U-shape trading pattern in 15-minute volume, but no such pattern is identified in intraday returns." Copyright (c) 2007 The Authors Journal compilation (c) 2007 Blackwell Publishing Ltd.
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