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The Index Effect: An Investigation of the Price, Volume and Trading Effects Surrounding Changes to the S & P Australian Indices

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    Abstract

    This paper examines the stock price and volume effects surrounding the announcement of constituent changes to the S&P/ASX 200 and four supplementary indices. Between April 2000 and December 2002 additions to (deletions from) the ASX 200 were associated with a significant price rise (fall) over the 10 day period following the market announcement of the change. Additions (deletions) also displayed a significant rise (fall) on the announcement date itself. These findings were corroborated by significant increases in trading volume over the same intervals, suggesting heavy trading activity by index funds in response to changes to the ASX 200. Following the implementation of these changes, both additions and deletions experienced a significant price reversion, supporting the price pressure hypothesis. In contrast, none of the supplementary indices displayed evidence of stock price or volume effects, thereby precluding the information and liquidity hypotheses as viable explanations for the findings of this research.

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    File URL: http://www.deakin.edu.au/buslaw/aef/workingpapers/papers/2007_07aef.pdf
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    Bibliographic Info

    Paper provided by Deakin University, Faculty of Business and Law, School of Accounting, Economics and Finance in its series Accounting, Finance, Financial Planning and Insurance Series with number 2007_07.

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    Length: 45 pages
    Date of creation: 07 May 2007
    Date of revision:
    Handle: RePEc:dkn:acctwp:aef_2007_07

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    Web page: http://www.deakin.edu.au/buslaw/aef/index.php

    Related research

    Keywords: Index change; price effect; volume effect; index fund; price pressure.;

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    1. 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.
    2. Scholes, Myron & Williams, Joseph, 1977. "Estimating betas from nonsynchronous data," Journal of Financial Economics, Elsevier, vol. 5(3), pages 309-327, December.
    3. A. Craig MacKinlay, 1997. "Event Studies in Economics and Finance," Journal of Economic Literature, American Economic Association, vol. 35(1), pages 13-39, March.
    4. Amihud, Yakov & Mendelson, Haim, 1986. "Asset pricing and the bid-ask spread," Journal of Financial Economics, Elsevier, vol. 17(2), pages 223-249, December.
    5. Shleifer, Andrei, 1986. " Do Demand Curves for Stocks Slope Down?," Journal of Finance, American Finance Association, vol. 41(3), pages 579-90, July.
    6. Beneish, Messod D. & Gardner, John C., 1995. "Information Costs and Liquidity Effects from Changes in the Dow Jones Industrial Average List," Journal of Financial and Quantitative Analysis, Cambridge University Press, vol. 30(01), pages 135-157, March.
    7. Pruitt, Stephen W & Wei, K C John, 1989. " Institutional Ownership and Changes in the S&P 500," Journal of Finance, American Finance Association, vol. 44(2), pages 509-13, June.
    8. Isidore Masse & Robert Hanrahan & Joseph Kushner & Felice Martinello, 2000. "The effect of additions to or deletions from the TSE 300 Index on Canadian share prices," Canadian Journal of Economics, Canadian Economics Association, vol. 33(2), pages 341-359, May.
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