個經問題 - 經濟

題目:A consumer has a utility function U(x1,x2) = max｛x1,x2｝
a. Does this preference exhibit local nonsatiation?
b. Is the preference convex?
c. What is the consumer’s demand function for good1?
d. What is his indirect utility function?
e. What is his expenditure function?

我的想法:
一開始就卡住了，無法畫出圖形，懇請解惑，謝謝

--