Question: 2.8 Show that if/(x1;x2) is a concave function, it is also a quasi-concave function. Do this by comparing Equation 2.107 (defining quasi-concavity) to Equation 2.88

2.8 Show that if/(x1;x2) is a concave function, it is also a quasi-concave function. Do this by comparing Equation 2.107 (defining quasi-concavity) to Equation 2.88 (denning concavity). Can you give an intuitive reason for this result? Is the converse of the statement true? Are quasiconcave functions necessarily concave?

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