ECON 102 Lecture Notes - Lecture 1: Externality, Marginal Cost, Business Cycle

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Scarcity the li(cid:373)ited (cid:374)atu(cid:396)e of so(cid:272)iety"s (cid:396)esou(cid:396)(cid:272)es. Economics the study of how society manages its scarce resources. Principle 1: people face trade-offs: ex: students who have to decide how to allocate their time. Efficiency the property of society getting the most it can from its scarce resources. Equality the property of distributing economic prosperity uniformly among the members of society. (cid:449)hat"s (cid:271)est fo(cid:396) effi(cid:272)ie(cid:374)(cid:272)y a(cid:374)d e(cid:395)uality usually (cid:272)o(cid:374)fli(cid:272)ts. People make better decisions when they understand the options available to them. Principle 2: the cost of something is what you give up to get it. Opportunity cost whatever must be give up to obtain some item. Principle 3: rational people think at the margin. Rational people people who systematically and purposefully do the best they can to achieve their objectives. Marginal change a small incremental adjustment to a plan of action. Rational people often make decisions by comparing marginal benefits and marginal costs.

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