Introduction toAgreement on Demand: Consumer Theory in the Twentieth Century
介绍需求理论（消费者选择理论）在微观经济学教材中的核心地位，指出其基本假设是需求曲线作为市场经济的现象规律存在，并探讨其科学解释的本质。
The theory of demand, or consumer choice theory, is prominently featured in the early chapters of every microeconomics textbook—introductory, intermediate, or graduate—and has appeared in essentially the same place and in the same basic form for over a half-century. The theory’s basic idea is quite simple, or at least seems to be so once the catechism has been learned. It goes like this. The theory begins with the assumption that demand curves relating the amount of a particular commodity that a consumer is willing and able to purchase at various prices exist as phenomenal regularities in market economies. These regularities, it is argued, could be empirically observed by asking the individual how much he (or she) would be willing and able to purchase at various prices and/or by simply observing his actual consumption behavior. In either case it is assumed that the functional relationship qi = D( pi) between the price ( pi) and quantity (qi) of good i exists and can be empirically estimated. Since the market demand curve is simply the sum of all of the individual demand curves for all the consumers in the market, these market demand curves are similarly assumed to exist as phenomenal regularities. Demand theory is simply an explanation—ostensibly a scientific explanation—of what is “behind,”