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All of the following are valid criticisms of the unconstrained mean-variance optimization except:...

All of the following are valid criticisms of the unconstrained mean-variance optimization except: It often produces unreasonable portfolios It sometimes generates weights that are greater than zero It often requires investment on margin It often requires short-selling which is hard for many investors to implement

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It sometimes generates weights that are greater than zero

This statement is not a criticism as getting positive weights is not incorrect

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