EC120 Lecture Notes - Lecture 2: Demand Curve

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EC120 Full Course Notes
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Employ the scientific method, developing and testing theories about how the world works. Use the best evidence to inform policy development. Simplifying the world to make it easier to understand. Assuming two countries and two goods (to understand. Usually unrealistic, but simple to learn and provide insight to trade) the real world. A simplified representation of a complex reality. We use models to study economic issues. Graphs of a single variable are limited in telling us the relationships between variables. Ex. (the relationship between study time, and gpa) Ordered pairs are graphed on a two dimensional grid. Two variables increasing or decreasing together have a positive. Two variables moving in opposite directions (one increases, the other decreases) have a negative correlation. Demand curve: shows the relationship between how the quantity of a good demanded and it"s price, holding everything else constant. A change in income will also change the quantity demanded at any given price.

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