# 101chapter3 - Chapter 3: Elasticity Price elasticity demand...

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13:00 Chapter 3: Elasticity Price elasticity demand supply Cross elasticity Income elasticity

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13:00 13:00 2 Basic idea We know when P Qd Qs holding other factors constant
13:00 13:00 3 but how much? if price doubles how much does Qd fall? by 10% by 50% by 300%? price elasticity tells us

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13:00 13:00 4 I. Price Elasticity of Demand example mocha latte at Starbucks price rises from \$3 to \$5 per cup Qd falls from 15 to 5 cups per hr.
13:00 13:00 5 equation % change in Qd % change in P

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13:00 13:00 6 % change in Qd new Qd - initial Qd average Qd x 100 midpoint method
13:00 13:00 7 example 5 cups - 15 cups (5+15)/2 cups x 100 -10 cups 10 cups x 100 = -100%

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13:00 13:00 8 % change in P new P - initial P average P x 100 midpoint method
13:00 13:00 9 example \$5 - \$3 (\$5+\$3)/2 x 100 \$2 \$4 x 100 = 50%

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13:00 13:00 10 demand elasticity % change in Qd % change in P -100% 50% = -2
13:00 13:00 11 If price of latte increases 1%, Qd of latte decreases 2%

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13:00 13:00 12 demand elasticity a unit-free measure changes for different points on the demand curve
13:00 13:00 13 if price elasticity of demand (absolute value) = 1 unit elastic % change Qd = % change P > 1 elastic % change Qd > %change P sensitive to P changes

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13:00 13:00 14 < 1 inelastic % change Qd < %change P not sensitive to P changes
13:00 13:00 15 elastic demand (>1) flatter curve P Q D small change in P big change in Qd

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13:00 13:00 16 inelastic demand (<1) steep curve P Q D big change in P small change in Qd
13:00 13:00 17 perfectly inelastic demand vertical line P Q D change in P no change in Qd

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13:00 13:00 18 perfectly elastic demand horizontal line P Q D any change in P Qd falls to zero
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## This note was uploaded on 07/19/2011 for the course ECON 101 taught by Professor Wood during the Spring '07 term at University of California, Berkeley.

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101chapter3 - Chapter 3: Elasticity Price elasticity demand...

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