为什么是b?我觉得如果y贵了，消费者会放弃y,全部买x.

Suppose utility is givenby U(x, y) = lnx + lny and px = 1, I = 10. If y must be purchased inwhole units, what is the maximum price this person would pay for that good?

a.         1.

*        b.         5.

c.         10.

d.         20.