Question: Recall that a utility function in multi-period portfolio optimization must be increasing and concave. Which of the following functions cannot be a utility function? u(x)=logx

Recall that a utility function in multi-period portfolio optimization must be

Recall that a utility function in multi-period portfolio optimization must be increasing and concave. Which of the following functions cannot be a utility function? u(x)=logx u(x)=exp[x] u(x)=1/x u(x)=x2

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