ECON 20 Lecture Notes - Lecture 1: Ceteris Paribus, Marginalism

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Economics- the study of how individuals and societies choose to use the scare resources that nature and previous generations have provided. Scarce- total quantity of good is less than people would choose if the good was free. Economics is what economists do and is a method rather than a subject. (how you treat a problem) Opportunity costs- cost lost when you choose something else. Marginalism- what changes when you do one more thing. Positive economics- questions of is or isn"t. verifiable by objective criteria- #"s data etc. Normative economics- question of ought or ought not-difficult quantity in terms of critera. The most common method of expressing the quantitative relationship between two variables is graphing that relationship on a two-dimensional plane (appendix page 15-20 for more) Model: a formal statement of a theory on how and why variables are related to each other. Often models in this class are presents with graphs, charts, etc.

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