申論題

2. Lisa must consume some good X at least the amount of Xo every day. The utility function of Lisa is U(X,Y)=(X-X₀)^aY^β, and a +β = 1. Lisa has an income of M. The price of good X is Px, and the price of good Y is Py. When M ＞ Px* X₀, what is the optimal choice of Lisa for good X and good Y? (5%)