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Stock Exchange Mergers and Market Efficiency

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Author Info

  • Amélie Charles

    ()
    (Audencia Recherche - Audencia)

  • Olivier Darné

    ()
    (LEMNA - Laboratoire d'économie et de management de Nantes Atlantique - Université de Nantes : EA4272)

  • Jae H. Kim

    ()
    (School of Economics and Finance - School of Economics and Finance)

  • Etienne Redor

    ()
    (Audencia Recherche - Audencia)

Abstract

The aim of this paper is to examine the positive and negative impacts of stock exchange mergers on the informational efficiency of the markets. We consider a range of factors in relation to the stock exchange merger, that can potentially affects market efficiency, after a merger. These factors include the maturity of the markets being merged, the size of the markets, and different types of mergers (developed markets versus developing markets; large stock exchange mergers versus small stock exchange mergers; and domestic stock exchange mergers versus cross-border stock exchange mergers). For this purpose, we use a time-varying return predictability test which allows us to detect periods of (in)efficiency, and thus to conduct a comparative analysis for pre-merger and post-merger periods. We find that increases in efficiency are less frequent than decreases in efficiency after a stock exchange merger. Finally, we provide the empirical evidence that the impact on efficiency depends on range of the characteristics of the merger: stock exchange's country's level of development, size, geographical diversification and industrial diversification.

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Bibliographic Info

Paper provided by HAL in its series Working Papers with number hal-00940105.

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Date of creation: 31 Jan 2014
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Handle: RePEc:hal:wpaper:hal-00940105

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Related research

Keywords: Stock exchange mergers; Market efficiency; Martingale difference sequence.;

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  1. Denis, David J & Denis, Diane K & Sarin, Atulya, 1997. " Agency Problems, Equity Ownership, and Corporate Diversification," Journal of Finance, American Finance Association, vol. 52(1), pages 135-60, March.
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  11. Khan, Walayet & Vieito, João Paulo, 2012. "Stock exchange mergers and weak form of market efficiency: The case of Euronext Lisbon," International Review of Economics & Finance, Elsevier, vol. 22(1), pages 173-189.
  12. John M. Griffin & Patrick J. Kelly & Federico Nardari, 2010. "Do Market Efficiency Measures Yield Correct Inferences? A Comparison of Developed and Emerging Markets," Review of Financial Studies, Society for Financial Studies, vol. 23(8), pages 3225-3277, August.
  13. Tom Arnold & Philip Hersch & J. Harold Mulherin & Jeffry Netter, 1999. "Merging Markets," Journal of Finance, American Finance Association, vol. 54(3), pages 1083-1107, 06.
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  15. Kim, Jae H., 2009. "Automatic variance ratio test under conditional heteroskedasticity," Finance Research Letters, Elsevier, vol. 6(3), pages 179-185, September.
  16. Quinn McNemar, 1947. "Note on the sampling error of the difference between correlated proportions or percentages," Psychometrika, Springer, vol. 12(2), pages 153-157, June.
  17. Reena Aggarwal, 2002. "Demutualization And Corporate Governance Of Stock Exchanges," Journal of Applied Corporate Finance, Morgan Stanley, vol. 15(1), pages 105-113.
  18. Choi, In, 1999. "Testing the Random Walk Hypothesis for Real Exchange Rates," Journal of Applied Econometrics, John Wiley & Sons, Ltd., vol. 14(3), pages 293-308, May-June.
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