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Is the Mexican Stock Market Becoming More Efficient?

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  • Roberto J. Santillán-Salgado

    (EGADE Business School, Monterrey Campus)

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    Abstract

    This paper studies the recent evolution of market efficiency in the Mexican Stock Exchange by testing the hypothesis that stock prices have become ”more efficient” through time. This is done by observing the evolution of the coefficients of the regressions between individual stocks returns and a market proxy sample portfolio. The sample of shares was selected under the criterion of a greater frequency of trading. Following Morck, Yeung and Yu’ (2000) work, we built a Market Proxy Sample Portfolio (MPSP) that includes 27 larger firms issuing shares (with respect to a relative capitalization measure), frequently traded shares, listed in the Mexican Stock Exchange. The database included daily closing prices from January 1999 to May 2010. The results of the tests indicate there is a downward trend in the magnitude of the average R2 during the first half of the decade, but there is an inflection in the trend in the last three years of the period of study, which may be explained by the extraordinary turbulence that prevailed during the 2007-2009 financial crisis.

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    File URL: http://www.remef.org.mx/c/images/uploads/documentos/21/articulo_roberto_santillan.pdf
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    Bibliographic Info

    Article provided by Instituto Mexicano de Ejecutivos de Finanzas. Remef in its journal Remef - The Mexican Journal of Economics and Finance.

    Volume (Year): (2012)
    Issue (Month): (October)
    Pages:

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    Handle: RePEc:imx:journl:20121021

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    Web page: http://www.remef.org.mx/

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    1. Fama, Eugene F, 1991. " Efficient Capital Markets: II," Journal of Finance, American Finance Association, vol. 46(5), pages 1575-617, December.
    2. Wurgler, Jeffrey, 2000. "Financial markets and the allocation of capital," Journal of Financial Economics, Elsevier, vol. 58(1-2), pages 187-214.
    3. Lucas, Robert Jr., 1988. "On the mechanics of economic development," Journal of Monetary Economics, Elsevier, vol. 22(1), pages 3-42, July.
    4. Levine, Ross, 1996. "Financial development and economic growth : views and agenda," Policy Research Working Paper Series 1678, The World Bank.
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    6. Brown, Stephen J. & Warner, Jerold B., 1985. "Using daily stock returns : The case of event studies," Journal of Financial Economics, Elsevier, vol. 14(1), pages 3-31, March.
    7. Bhattacharya, Utpal & Daouk, Hazem & Jorgenson, Brian & Kehr, Carl-Heinrich, 1998. "When an event is not an event: The curious case of an emerging market," CFS Working Paper Series 1998/12, Center for Financial Studies (CFS).
    8. De Long, J Bradford & Andrei Shleifer & Lawrence H. Summers & Robert J. Waldmann, 1990. "Noise Trader Risk in Financial Markets," Journal of Political Economy, University of Chicago Press, vol. 98(4), pages 703-38, August.
    9. Corrado, Charles J., 1989. "A nonparametric test for abnormal security-price performance in event studies," Journal of Financial Economics, Elsevier, vol. 23(2), pages 385-395, August.
    10. Kawakatsu, Hiroyuki & Morey, Matthew R., 1999. "Financial liberalization and stock market efficiency: an empirical examination of nine emerging market countries," Journal of Multinational Financial Management, Elsevier, vol. 9(3-4), pages 353-371, November.
    11. Urrutia, Jorge L, 1995. "Tests of Random Walk and Market Efficiency for Latin American Emerging Equity Markets," Journal of Financial Research, Southern Finance Association & Southwestern Finance Association, vol. 18(3), pages 299-309, Fall.
    12. Levine, Ross, 1991. " Stock Markets, Growth, and Tax Policy," Journal of Finance, American Finance Association, vol. 46(4), pages 1445-65, September.
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