32. ELASTICITY EQUATION BENCHMARK
Price Elasticity
of Demand
Cross-Price
Elasticity
Income
Elasticity
Price Elasticity
of Supply
Midpoint
Formula
Inelastic | Elastic
1
Compliments | Substitutes
0
Inferior | Normal | Luxury
0 1
Inelastic | Elastic
1
%∆QD
%∆P
%∆QS
%∆P
%∆QD1
%∆P2
%∆QD
%∆I
∆Q
∆PQ
Px
33. 1. Prices increase from $5.00 to $6.00.
Quantity demanded decreases from 80 units
to 60 units.
What is the price elasticity of demand?
What is the total revenue at $5.00 per unit?
What is the total revenue at $6.00 per unit?
2. If I increase prices from $20 to $25,
quantity demanded decreases from 1,000
units to 900 units. Should I raise prices?
Why?
3. Prices increase from $10 to $15 for
product A. Quantity demanded for product B
increases from 500 units to 600 units
What is the cross-price elasticity of
demand? Are these products compliments
or substitutes?
4. Prices increase from $10 to $15 for
product C. Quantity demanded for product B
decreases from 40 units to 30 units
What is the cross-price elasticity of
demand? Are these products compliments
or substitutes?
5. Your income increase from $10 to $15 per
hour. Quantity demanded for product E
decreases from 20 units to 15 units
What is the income elasticity of demand? Is
this product an inferior, normal, or luxury
good?
6. Your income decreases from $12 to $10
per hour. Quantity demanded for product F
increases from 10 units to 12 units
What is the income elasticity of demand? Is
this product an inferior, normal, or luxury
good?
Elasticity Quiz
34. 1. Prices increase from $5.00 to $6.00.
Quantity demanded decreases from 80 units
to 60 units.
What is the price elasticity of demand? 1.57
if you used the midpoint formula.
What is the total revenue at $5.00 per unit?
$400
What is the total revenue at $6.00 per unit?
$360
2. If I increase prices from $20 to $25,
quantity demanded decreases from 1,000
units to 900 units. Should I raise prices? Yes
Why? TR will increase from $20,000 to
$22,500.
3. Prices increase from $10 to $15 for
product A. Quantity demanded for product B
increases from 500 units to 600 units
What is the cross-price elasticity of
demand? .4
Are these products compliments or
substitutes? Substitutes
4. Prices increase from $10 to $15 for
product C. Quantity demanded for product B
decreases from 40 units to 30 units
What is the cross-price elasticity of
demand? -.5 Are these products
compliments or substitutes? Compliments
5. Your income increase from $10 to $15 per
hour. Quantity demanded for product E
decreases from 20 units to 15 units
What is the income elasticity of demand? -.5
Is this product an inferior, normal, or luxury
good? Inferior
6. Your income decreases from $12 to $10
per hour. Quantity demanded for product F
increases from 10 units to 12 units
What is the income elasticity of demand?
-1.2 Is this product an inferior, normal, or
luxury good? Inferior
Elasticity Quiz - Answers