ECON 110 Lecture Notes - Lecture 4: Arc Elasticity, Joule, Formula D

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ECON 110 Full Course Notes
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Relevant questions: % change in quantity demanded in response to a % change in price, % change in expenditure to a % change in price? elastic is higher than with qd p nb 1. At point (q0, p0), elasticities are p1 different along the two different. Q (( p/ q) = slope of the demand curve on diagram below) p. Nb elasticity also changes across different demand curves at the same point. Point vs. arc elasticities: pt elasticity is correct but arc elasticity is a useful approximation. Point elasticity uses the formula d = ( q/ p)(p/q) where p/ q is the slope on your diagram. Q/ p would be slope b from demand function q(p) = a + bp, where b = q/ p. Own-price elasticity depends on the availability of substitutes: the larger the number of substitutes, the higher the elasticity.

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