Abstract
This paper examines the price dynamics in the S&P 500 and Nasdaq-100 index futures contracts. By utilizing transactions data with attached trader type identification codes, we are able to analyze price dynamics for trades initiated by exchange locals and off-exchange customers. The empirical results show that price discovery appears to be initiated in the E-mini index futures contracts and that trades initiated by exchange locals seem to be more informative than those initiated by off-exchange traders. Furthermore, results show that exchange locals appear to make informed trades on the E-mini contracts around large trades that occur on the open outcry floor. We maintain that the exchange locals' ability to observe pit dynamics may contribute toward explaining the price leadership of the E-mini contracts. Overall, the results are consistent with the notion that exchange locals are informed traders who derive their informational advantage from the proximity to order flow.
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