ECON 20 Chapter Notes - Chapter 4: Price Elasticity Of Demand, Inferior Good, Dependent And Independent Variables

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Elasticity of demand with respect to a given variable is the coefficient of the variable multiplied by ratio of the variable to the quantity demanded. For a linear demand curve, the value of an elasticity depends on the price and quantity at which it is calculated. Own price elasticity is not the same as the slope of the demand curve. Demand is elastic in high prices and inelastic in low prices. For prices near zero, demand is inelastic. When prices rise, qx decreases and the absolute value of the elasticity increases. Example: own price elasticity of demand = -1. 15. Interpretation: if a company raises the price of good x, the percentage decline in the quantity demanded will be greater in absolute value than the % rise in price. Total revenues will fall if they raise shoe prices. Since it is positive, good y is a substitute for good x. Good x is an inferior good because it is negative.

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