Testing equity market efficiency around terrorist attacks

Les Coleman (les.coleman@unimelb.edu.au)

Applied Economics, 2012, vol. 44, issue 31, 4087-4099

Abstract: This article uses the nine major bombings since 1998 that have been attributed to Al Qaida to examine market efficiency, including a test of rumours that investors traded with advance knowledge of attacks. Analysis of these related, but individually unexpected, events confirms markets are semi-strong efficient: it now takes well under a trading day to fully price in a completely unexpected attack. On balance, markets also proved strongly efficient with no conclusive evidence of insider trading.

Date: 2012
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DOI: 10.1080/00036846.2011.587778

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