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Author:Woglom, Geoffrey 

Working Paper
The S&P 500 effect: not such good news in the long run

This paper analyzes the effect on a company's stock price when it is added to the S&P 500 Index. A simple theoretical model is developed to show how trading effects and changes to fundamentals should affect the price of S&P500 additions upon announcement and in the long run. This model predicts that a company added to the S&P500 should experience an initial price increase followed by a reversal of this price increase owing to the predicted increased stock price volatility of companies post-addition. All of these effects should be growing over time because of the increasing importance of ...
Finance and Economics Discussion Series , Paper 2002-48

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