其实我最近在下决心读范里安的微观，并且有发帖做记录
https://bbs.pinggu.org/forum.php?mod=viewthread&tid=1312524&page=1&extra=#pid11483427
然后看书的过程中有点小问题。

书里的原文是：（在P30页）

EXAMPLE: The Food Stamp Program

It is to say, poor families were allowed topurchase food stamps, which could then be used to purchase food at retailoutlets. For example, a family of four could receive a maximum monthlyallotment of $153 in food coupons by participating in the program. They can purchasethese food stamps by $80.The way that the Food Stamp program affected the budget set of a household is depicted in Figure 2.6A. Herewe have measured the amount of money spent on food on the horizontal axis andexpenditures on all other goods on the vertical axis. Since we are measuringeach good in terms of the money spent on it, the “price” of each good isautomatically 1, and the budget line will therefore have a slope of −1.

My question is, when the food consumptionis less than $153, such as $100, this family still has to pay $80 to buy thisfood stamp. After that, the maximum consumption of other goods is (budget-80), not (budget).
所以我觉得那个蓝色的预算线不会和之前黑色的预算线相交于A点呀，想错了么……？

嘻嘻，希望有想法的积极回帖哈

一起讨论

也希望你可以回在原帖里https://bbs.pinggu.org/forum.php? ... &extra=#pid11483427

我也会加分的~~

谢谢！