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Chapter 4第四章UTILITY MAXIMIZATON AND CHOICE效用最大化和选择1
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Optimization Principle最优化准则•To maximize utility, given a fixed amount of income to spend, an individual will buy the goods and services为了最大化效用，给定一定数量的收入，个人会购买商品和服务，直到:–that exhaust his or her total income 耗尽他（她）所有的收入–for which the psychic rate of trade-off between any goods (the MRS) is equal to the rate at which goods can be traded for one another in the marketplace 任意商品间进行交换的比率（MRS）与商品间在市场中交换的比率相同2