1996
DOI: 10.1111/j.1540-6261.1996.tb05231.x
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An Anatomy of the “S&P Game”: The Effects of Changing the Rules

Abstract: This study analyzes the effects of changes in S&P 500 index composition from January 1986 through June 1994, a period during which Standard and Poor's began its practice of preannouncing changes five days beforehand. The new announcement practice has given rise to the “S&P game” and has altered the way stock prices react. We find that prices increase abnormally from the close on the announcement day to the close on the effective day. The overall increase is greater than under the old announcement policy althou… Show more

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Cited by 250 publications
(227 citation statements)
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“…Abnormal volume performance was estimated using volume ratios, a method also employed by Harris and Gurel (1986) and Beneish and Whaley (1996). The average relative stock-to-S&P 500 volume ratios were estimated over a period of 12 weeks (60 trading days) before the event period, considered as the base volume for each added stock.…”
Section: Abnormal Trading Volumementioning
confidence: 99%
“…Abnormal volume performance was estimated using volume ratios, a method also employed by Harris and Gurel (1986) and Beneish and Whaley (1996). The average relative stock-to-S&P 500 volume ratios were estimated over a period of 12 weeks (60 trading days) before the event period, considered as the base volume for each added stock.…”
Section: Abnormal Trading Volumementioning
confidence: 99%
“…Once the index rebalancing process is completed, demand curves and prices revert to their original levels. However, Beneish and Whaley (1996) attribute the reverse in liquidity improvements following additions to the price pressure of arbitrageurs who tend to buy potential additions beforehand and sell them to the index funds on the effective dates.…”
Section: Related Literaturementioning
confidence: 99%
“…Some studies, including Pruitt and Wei (1989), Beneish and Whaley (1996), Doeswijk (2005) and Vespro (2006), find that the effect of index revisions on the underlying stock liquidity is short-lived. The temporary improvement in stock market liquidity is commonly attributed to the trading effects of index funds and arbitrageurs.…”
Section: Related Literaturementioning
confidence: 99%
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“…The authors re-examine individual stock additions to the S&P 500 stock index and report significantly steeper demand curves for stocks with higher levels of arbitrage 1 See also Garry and Goetzmann (1986), Harris and Gurel (1986), Dillon and Johnson (1991), Beneish and Whaley (1996), Lynch and Mendenhall (1997), and Kappou, Brooks and Ward (2010), among others, for US stock index data and Chakrabarti et al (2005) for international evidence. Hau, Massa and Peress (2010) present evidence that a December 2000 reweighting of the MSCI international equity index affected exchange rates.…”
Section: Related Literaturementioning
confidence: 99%