Elasticity. McGraw-Hill/Irwin. Copyright 2012 by The McGraw-Hill Companies, Inc. All rights reserved.
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1 04 Elasticity McGraw-Hill/Irwin Copyright 2012 by The McGraw-Hill Companies, Inc. All rights reserved.
2 LO1 4-2 Price Elasticity of Demand Measures buyers responsiveness to price changes Elastic demand Sensitive to price changes Large change in quantity Inelastic demand Insensitive to price changes Small change in quantity
3 LO1 4-3 Price Elasticity of Demand Formula Formula for price elasticity of demand E d = Percentage Change in Quantity Demanded of Product X Percentage Change in Price of Product X
4 LO1 4-4 Price Elasticity of Demand Formula Use the midpoint formula Ensures consistent results Change in quantity E d = Change in price Sum of quantities / 2 Sum of prices / 2
5 LO1 4-5 Price Elasticity of Demand Formula Use percentages Unit free measure Compare responsiveness across products Eliminate the minus sign Easier to compare elasticities
6 LO1 4-6 Interpretation of Elasticity of Demand E d > 1 demand is elastic E d = 1 demand is unit elastic E d < 1 demand is inelastic Extreme cases Perfectly inelastic Perfectly elastic
7 LO1 4-7 Extreme Cases P D 1 Perfectly inelastic demand (Ed = 0) 0 Perfectly inelastic demand
8 LO1 4-8 Extreme Cases P Perfectly elastic demand (Ed = ) D 2 0 Perfectly elastic demand
9 LO2 4-9 Total Revenue Test Total Revenue = Price x Quantity Inelastic demand P and TR move in the same direction Elastic demand P and TR move in opposite directions
10 LO Summary of Price Elasticity of Demand Price Elasticity of Demand: A Summary Absolute Value of Elasticity Coefficient Demand Is Description Greater than 1 (E d > 1) Equal to 1 (E d = 1) Less than 1 (E d < 1) Elastic or relatively elastic Unit or unitary elastic Inelastic or relatively inelastic Q d changes by a larger percentage than does price Q d changes by the same percentage as does price Q d changes by a smaller percentage than does price Impact on Total Revenue of a: Price Increase Total revenue decreases Total revenue is unchanged Total revenue increases Price Decrease Total revenue increases Total revenue is unchanged Total revenue decreases
11 LO Determinants of Elasticity of Demand Substitutability More substitutes, demand is more elastic Proportion of Income Higher proportion of income, demand is more elastic Luxuries vs. Necessities Luxury goods, demand is more elastic Time More time available, demand is more elastic
12 LO Price Elasticity of Supply Measures sellers responsiveness to price changes Elastic supply, producers are responsive to price changes Inelastic supply, producers are not responsive to price changes
13 LO Price Elasticity of Supply Formula to compute elasticity E s > 1 supply is elastic E s < 1 supply is inelastic E s = Percentage Change in Quantity Supplied of Product X Percentage Change in Price of Product X
14 LO Cross Elasticity of Demand Measures responsiveness of sales to change in the price of another good Substitutes positive sign Complements negative sign Independent goods - zero E x,y = Percentage change in quantity demanded of product X Percentage change in price of product Y
15 LO Income Elasticity of Demand Measures responsiveness of buyers to changes in income Normal goods positive sign Inferior goods negative sign E i = Percentage change in quantity demanded Percentage change in income
16 LO E x,y and E i Cross and Income Elasticities of Demand Value of Coefficient Description Type of Good(s) Cross elasticity: Positive (E wz > 0) Quantity demanded of W changes in same direction as change in price of Z Substitutes Negative (E xy < 0) Income elasticity: Positive (E i >0) Negative (E i <0) Quantity demanded of X changes in opposite direction from change in price of Y Quantity demanded of the product changes in same direction as change in income Quantity demanded of the product changes in opposite direction from change in income Complements Normal or superior Inferior
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