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Recently, an influential academic study and many lawsuits have claimed that the VIX index has been manipulated since 2008. In this paper, we construct a regression model with explanatory variables that are exogenous to the index and examine the model prediction errors. We find that the movements...
We examine the effect of corporate diversification by comparing abnormal returns between portfolios of diversified firms and focused firms. Our study covers US firms for the years 1976–2009 and compares abnormal returns over 12, 24, and 36-month windows. Initial univariate tests show mixed...
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