Given the standard deviation of two assets, what is the smallest value of the correlation?
... coefficient for which the portfolio frontier bends backwards? (Hint: assuming asset A has the lower return and the gradient of the frontier at XA
... coefficient for which the portfolio frontier bends backwards? (Hint: assuming asset A has the lower return and the gradient of the frontier at XA=1)
or:... coefficient for which the portfolio frontier bends backwards? (Hint: assuming asset A has the lower return and the gradient of the frontier at XA=1)
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