Question: Suppose that the expected return and standard deviation of stock A are 10% and 5% respectively, while the expected return and standard deviation of stock

Suppose that the expected return and standard deviation of stock A are 10% and 5% respectively, while the expected return and standard deviation of stock B are 15% and 10% respectively. Returns of stock A and B are perfectly negatively correlated. Also suppose that it is possible to borrow at the risk-free rate. What must be the value of the risk-free rate?

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