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Testing equity market efficiency around terrorist attacks

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  • Les Coleman

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.

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  • Les Coleman, 2012. "Testing equity market efficiency around terrorist attacks," Applied Economics, Taylor & Francis Journals, vol. 44(31), pages 4087-4099, November.
    • Handle: RePEc:taf:applec:44:y:2012:i:31:p:4087-4099
    DOI: 10.1080/00036846.2011.587778
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    1. Faheem Aslam & Amir Rafique & Aneel Salman & Hyoung-Goo Kang & Wahbeeah Mohti, 2018. "The Impact Of Terrorism On Financial Markets: Evidence From Asia," The Singapore Economic Review (SER), World Scientific Publishing Co. Pte. Ltd., vol. 63(05), pages 1183-1204, December.
    2. Klaudia Radoczy & Akos Toth-Pajor, 2021. "Investors' Reactions to Extreme Events in the Hungarian Stock Market," Financial and Economic Review, Magyar Nemzeti Bank (Central Bank of Hungary), vol. 20(3), pages 5-30.
    3. Hudson, Robert & Urquhart, Andrew, 2015. "War and stock markets: The effect of World War Two on the British stock market," International Review of Financial Analysis, Elsevier, vol. 40(C), pages 166-177.
    4. Al-Shboul, Mohammad & Alsharari, Nizar, 2019. "The dynamic behavior of evolving efficiency: Evidence from the UAE stock markets," The Quarterly Review of Economics and Finance, Elsevier, vol. 73(C), pages 119-135.
    5. Piccoli, Pedro & Chaudhury, Mo & Souza, Alceu, 2017. "How do stocks react to extreme market events? Evidence from Brazil," Research in International Business and Finance, Elsevier, vol. 42(C), pages 275-284.
    6. Aslam Faheem & Awan Tahir Mumtaz & Mohmand Yasir Tariq & Kang Hyoung-Goo & Mughal Khurrum Shahzad, 2021. "Stock Market Volatility and Terrorism: New Evidence from the Markov Switching Model," Peace Economics, Peace Science, and Public Policy, De Gruyter, vol. 27(2), pages 263-284, May.

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