题目

关于微观经济学的一个基本问题
经济学问题：After learning the law of demand from the lecture,Alan has a question about his demand for economic text book.Alan knows that every student will at most buy one textbook.This is true even if the price of it drops.In other words,each student's demand curve for textbook is not downward sloping and this contradicts the law of demand.Is his argument right?求中文解答,首先不知道为什么会downward sloping,其次就是为何是不矛盾的,该如何解释这种现象?

提问时间：2020-11-15

答案

我不知道你有没学到微观里的elasticity的概念.
其中有一个perfect inelastic demand ,this means that demand for the product is not affected by changes in prices. according to your question where it sates every student will at most buy one textbook therefore, demand curve will be illustrated as a vertical straight line, even price of book drops, it is not affected on quantity demanded for book.example includes monopoly
while, it is certainly contridicted to the law of demand which states an inverse relationship between the price of a good and the quantity demanded of that good.