For m > p2, the demand functions for goods 1 and 2 are given by the equations, x1 = p1/p2 and x2 = (m/p1) – 1 where m is income and p1 and p2 are prices. Let the horizontal axis represent the quantity of good 1. Let p1 = 1 and p2 = 2. Then for m > 2, the income offer curve is:
(a) a straight line with a slope of ½.
(b) a horizontal line.
(c) a straight line with slope 2.
(d) a vertical line.
(e) none of the above.

為何答案是b

[此贴子已经被作者于2006-10-2 1:56:33编辑过]