ECO-3101 Chapter Notes - Chapter 1: Price Ceiling, Equation, Exogeny

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Economics proceeds by developing models of social phenomena: we want to choose the simplest way to fully represent a situation, then, we can add other complications to make the model more realistic. Exogenous variable: determined by factors not discussed in the model. Endogenous variable: determined by factors in the model. The optimization principle: people try to choose the best patterns of consumption that they can afford. The equilibrium principle: prices adjust until the amount that people demand of something is equal to the amount that is supplied. Reservation price: a person"s maximum willingness to pay for something; the highest price someone will pay for something. Demand curve: a curve that relates the quantity demanded to price: slopes down (negative slope, when price goes up, people pay less. Competitive market: many individuals willing to supply goods at the highest price the market will take. A system with different prices being charged for the same good cannot result in equilibrium.

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