The Costs of Taxation How do taxes affect the economic well- being of market participants?

International Trade What determines whether a country imports or exports a good?

The Meaning of Competition uA perfectly competitive market has the following characteristics: u There are many buyers and sellers in the market

Monopoly While a competitive firm is a price taker, a monopoly firm is a price maker

Imperfect Competition Imperfect competition refers to those market structures that fall between perfect competition and pure monopoly

Harcourt, Inc. items and derived items copyright © 2001 by Harcourt, Inc. The Four Types of Market Structure Monopoly Oligopoly Monopolistic Competition Perfect Competition

一、我国居民目前的膳食情况——膳食失调 患病上升 二、中国居民膳食指南

宏量元素：钠、钾、钙、磷、镁、氯、硫 微量元素：铁、铜、钴、碘等。 矿物质在体内分布的特殊性； 维生素是维持机体正常生理功能及细胞内特异代谢反应所必需的一大类低分子化合物。 维生素按其溶解性分为脂溶性和水溶性两大类。 脂溶性维生素 维生素A及胡萝卜素 维生素D 维生素E 维生素C

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