ECON 201 Lecture Notes - Lecture 5: Optimal Decision, Marginal Utility, Marginal Cost

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We must make choices because we live in a world of scarcity, which means that although our wants are unlimited, the resources available to fulfill those wants are limited. Economics is the study of the choices consumers, business managers, and government officials make to attain their goals, given their scarce resources. Economic models are simplified versions of reality used to analyze real-world economic situations. A market is a group of buyers and sellers of a good or service and the institutions or arrangement by which they come together to trade. Three important ideas about markets: people are rational, people respond to economic incentives, optimal decision are made at the margin. Assume that consumers and firms use all available information as they act to achieve their goals. Weight the benefits and the costs of each action. Choose an action only if the benefit outweigh the costs.

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