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Suppose I have two equities, X and Y, that each have mean excess returns of X and Y respectively, and the standard deviations of their

Suppose I have two equities, X and Y, that each have mean excess returns of X and Y respectively, and the standard deviations of their excess returns are X and Y respectively. In addition, suppose that they are perfectly negatively correlated so XY = 1. Show that it is possible to have a zero variance portfolio.

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