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Long-Term Price Overreactions: Are Markets Inefficient?

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  • Guglielmo Maria Caporale
  • Luis Gil-Alana
  • Alex Plastun

Abstract

This paper examines long-term price overreactions in various financial markets (commodities, US stock market and FOREX). First, t-tests are carried out for overreactions as a statistical phenomenon. Second, a trading robot approach is applied to test the profitability of two alternative strategies, one based on the classical overreaction anomaly, the other on a so-called “inertia anomaly”. Both weekly and monthly data are used. Evidence of anomalies is found predominantly in the case of weekly data. In the majority of cases strategies based on overreaction anomalies are not profitable, and therefore the latter cannot be seen as inconsistent with the EMH.

Suggested Citation

  • Guglielmo Maria Caporale & Luis Gil-Alana & Alex Plastun, 2015. "Long-Term Price Overreactions: Are Markets Inefficient?," Discussion Papers of DIW Berlin 1444, DIW Berlin, German Institute for Economic Research.
    • Handle: RePEc:diw:diwwpp:dp1444
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    Cited by:

    1. Plastun, Alex & Sibande, Xolani & Gupta, Rangan & Wohar, Mark E., 2021. "Evolution of price effects after one-day abnormal returns in the US stock market," The North American Journal of Economics and Finance, Elsevier, vol. 57(C).
    2. Charteris, Ailie & Kallinterakis, Vasileios, 2021. "Feedback trading in retail-dominated assets: Evidence from the gold bullion coin market," International Review of Financial Analysis, Elsevier, vol. 75(C).
    3. Alex Plastun & Xolani Sibande & Rangan Gupta & Qiang Ji, 2022. "Price Effects After One-Day Abnormal Returns and Crises in the Stock Markets," Working Papers 202222, University of Pretoria, Department of Economics.
    4. Borgards, Oliver & Czudaj, Robert L., 2020. "The prevalence of price overreactions in the cryptocurrency market," Journal of International Financial Markets, Institutions and Money, Elsevier, vol. 65(C).
    5. Zvonko Merkaš & Vlasta Roška, 2021. "The Impact of Unsystematic Factors on Bitcoin Value," JRFM, MDPI, vol. 14(11), pages 1-17, November.
    6. Lee, Namhoon & Choi, Wonseok & Pae, Yuntaek, 2021. "Market efficiency in foreign exchange market," Economics Letters, Elsevier, vol. 205(C).
    7. Borgards, Oliver & Czudaj, Robert L., 2021. "Features of overreactions in the cryptocurrency market," The Quarterly Review of Economics and Finance, Elsevier, vol. 80(C), pages 31-48.

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    More about this item

    Keywords

    Efficient Market Hypothesis; anomaly; overreaction hypothesis; abnormal returns; contrarian strategy; trading strategy; trading robot; t-test;
    All these keywords.

    JEL classification:

    • G12 - Financial Economics - - General Financial Markets - - - Asset Pricing; Trading Volume; Bond Interest Rates
    • G17 - Financial Economics - - General Financial Markets - - - Financial Forecasting and Simulation
    • C63 - Mathematical and Quantitative Methods - - Mathematical Methods; Programming Models; Mathematical and Simulation Modeling - - - Computational Techniques

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