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The excess of actual return over the level of return that would be expected given the riskiness of a portfolio....more on Abnormal return
http://moneyterms.co.uk/
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Return on a stock beyond what would be predicted by market movements alone. Cumulative abnormal return (CAR) is the total abnormal return for the period surrounding an announcement or the release of information.
http://www.winnerscircletrading.com/trading-terms.htm
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