unit 2: supply, demand, and consumer choice can they see me?
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Unit 2: Supply, Demand, and Consumer Choice
Can they see me?
Demand
DEMANDWhat is Demand?
Demand is the different quantities of goods that consumers are willing and able to buy at different prices.
What is the Law of Demand? INVERSE relationship between price and
quantity demanded
Why does the Law of Demand occur?1. The Substitution effect 2. The Income effect3. The Law of Diminishing Marginal Utility
What Causes a Shift in Demand?
5 Determinates of Demand (SHIFTERS) :
1.Tastes and Preferences2.Number of Consumers3.Price of Related Goods4. Income5.Future Expectations
Changes in PRICE don’t shift the curve.
Prices of Related Goods
Substitutes
P _____Demand for Other _____P _____Demand for Other _____
Compliments
P _____Demand for Other _____P _____Demand for Other _____
Income
Normal
Income _____Demand _____Income _____Demand _____
Inferior
Income _____Demand _____Income _____Demand _____
If Z is an inferior good, a decrease in income will shift the:
A) supply curve for Z to the left.
B) supply curve for Z to the right.
C) demand curve for Z to the left.
D) demand curve for Z to the right
E) there is no shift since this only changes price
Other things equal, if the price of a key resource used to produce product X falls, the:
A) supply curve of X will shift to the right.
B) demand curve of X will shift to the right.
C) supply curve of X will shift to the left.
D) demand curve of X will shift to the right.
E)both the supply and demand of X will increase
Supply
SupplyWhat is supply?Supply is the different quantities of a good that sellers are willing and able to sell (produce) at different prices.
What is the Law of Supply?There is a DIRECT (or positive) relationship between price and quantity supplied.
Shifters• Prices/Availability of inputs (resources)• Number of Sellers• Technology• Government Action: Taxes & Subsidies• Opportunity Cost of Alternative Production• Expectations of Future Profit
Price Controls
7
SP
Qo
$5
4
3
2
1
2 4 6 8 10 12 14 16
D
Price of Corn
Quantity of Corn
Draw an effective Price Floor and Price CeilingWhat are the results?
7
SP
Qo
$5
4
3
2
1
2 4 6 8 10 12 14 16
D
Price of Corn
Quantity of Corn
Shortage
SurplusFloor
Ceiling
At price $20, there would be a surplus of… A) 100 B) 150 C) 200 D) 50 E) 0
What would be the effect of a price floor at $60A) It would be ineffective E) A shortage of 100 B) A shortage of 50 D) A surplus of 100C) Quantity demanded would increase
Excise TaxesTaxes on producers
PracticeFRQ #1
Double Shifts• Demand for sports cars fell at the same time as
production technology improved. • What happens to P and Q?
If TWO curves shift at the same time, EITHER price or quantity
will be indeterminate.
Which of the following statements is correct? A) If demand increases and supply decreases, equilibrium price will fall. B) If the demand and the supply both fall at the same time, quantity will be indeterminate C) If demand decreases and supply increases, equilibrium price will rise. D) If supply increases and demand decreases, equilibrium price will fall. E) If supply falls and demand remains constant, equilibrium price will fall.
S
P
Q
D
How does the S&D graph show consumer and producer’s surplus?
$10
8765432
10 11 12 136 7 8 9
Consumer’s Surplus = Buyers Maximum - Price
Producer’s Surplus = Price- Sellers Minimum
Practice FRQ #2
Elasticity
Inelastic Demand
•If price increases, quantity demanded will fall a little•If price decreases, quantity demanded increases a little.
In other words, people will continue to buy it.
General Characteristics of INelastic Goods:• Few Substitutes• Necessities• Small portion of income• Required now, rather than later
20%
5%
INelastic = Insensitive to a change in price.
Elastic Demand
•If price increases, quantity demanded will fall a lot•If price decreases, quantity demanded increases a lot.
In other words, the amount people buy is sensitive to price.
General Characteristics of Elastic Goods:• Many Substitutes• Luxuries• Large portion of income• Plenty of time to decide
Elastic = Sensitive to a change in price.
Perfectly and Unit Elastic
Perfectly INELASTIC Unit Elastic (45 degrees)
Total Revenue TestUse elasticity to show how changes in price
will affect total revenue (TR). Elastic Demand-
• Price _____ causes TR to _____• Price _____ causes TR to _____
Inelastic Demand • Price _____ causes TR to _____• Price _____ causes TR to _____
Unit Elastic-• Price _____causes TR to ______
Practice FRQ #3
Consumer Choice
First 10 -- 24 --
$ 10 income
UTILITY MAXIMIZING COMBINATION
To maximize utility, how should the $10 income be allocated?
Unit ofproduct
Product A:Price = $1
Product B:Price = $2
Marginalutility,utils
Marginalutility per
dollar(MU/price)
Marginalutility,utils
Marginalutility per
dollar(MU/price)
First 10 10 24 12
$ 10 income
UTILITY MAXIMIZING COMBINATION
Unit ofproduct
Product A:Price = $1
Product B:Price = $2
Marginalutility,utils
Marginalutility per
dollar(MU/price)
Marginalutility,utils
Marginalutility per
dollar(MU/price)
Examine themarginal utilities per dollar
$ 10 income
UTILITY MAXIMIZING COMBINATION
Unit ofproduct
Product A:Price = $1
Product B:Price = $2
Marginalutility,utils
Marginalutility per
dollar(MU/price)
Marginalutility,utils
Marginalutility per
dollar(MU/price)
First 10 10 24 12Second 8 8 20 10Third 7 7 18 9Fourth 6 6 16 8Fifth 5 5 12 6Sixth 4 4 6 3Seventh 3 3 4 2
First 10 10 24 12Second 8 8 20 10Third 7 7 18 9Fourth 6 6 16 8Fifth 5 5 12 6Sixth 4 4 6 3Seventh 3 3 4 2
$ 10 income
UTILITY MAXIMIZING COMBINATION
Unit ofproduct
Product A:Price = $1
Product B:Price = $2
Marginalutility,utils
Marginalutility per
dollar(MU/price)
Marginalutility,utils
Marginalutility per
dollar(MU/price)
First 10 10 24 12Second 8 8 20 10Third 7 7 18 9Fourth 6 6 16 8Fifth 5 5 12 6Sixth 4 4 6 3Seventh 3 3 4 2
$ 10 income
UTILITY MAXIMIZING COMBINATION
Unit ofproduct
Product A:Price = $1
Product B:Price = $2
Marginalutility,utils
Marginalutility per
dollar(MU/price)
Marginalutility,utils
Marginalutility per
dollar(MU/price)
First 10 10 24 12Second 8 8 20 10Third 7 7 18 9Fourth 6 6 16 8Fifth 5 5 12 6Sixth 4 4 6 3Seventh 3 3 4 2
$ 10 income
UTILITY MAXIMIZING COMBINATION
Unit ofproduct
Product A:Price = $1
Product B:Price = $2
Marginalutility,utils
Marginalutility per
dollar(MU/price)
Marginalutility,utils
Marginalutility per
dollar(MU/price)
First 10 10 24 12Second 8 8 20 10Third 7 7 18 9Fourth 6 6 16 8Fifth 5 5 12 6Sixth 4 4 6 3Seventh 3 3 4 2
$ 10 income
UTILITY MAXIMIZING COMBINATION
Unit ofproduct
Product A:Price = $1
Product B:Price = $2
Marginalutility,utils
Marginalutility per
dollar(MU/price)
Marginalutility,utils
Marginalutility per
dollar(MU/price)
First 10 10 24 12Second 8 8 20 10Third 7 7 18 9Fourth 6 6 16 8Fifth 5 5 12 6Sixth 4 4 6 3Seventh 3 3 4 2
$ 10 income
UTILITY MAXIMIZING COMBINATION
Unit ofproduct
Product A:Price = $1
Product B:Price = $2
Marginalutility,utils
Marginalutility per
dollar(MU/price)
Marginalutility,utils
Marginalutility per
dollar(MU/price)
First 10 10 24 12Second 8 8 20 10Third 7 7 18 9Fourth 6 6 16 8Fifth 5 5 12 6Sixth 4 4 6 3Seventh 3 3 4 2
$ 10 income
UTILITY MAXIMIZING COMBINATION
Unit ofproduct
Product A:Price = $1
Product B:Price = $2
Marginalutility,utils
Marginalutility per
dollar(MU/price)
Marginalutility,utils
Marginalutility per
dollar(MU/price)
First 10 10 24 12Second 8 8 20 10Third 7 7 18 9Fourth 6 6 16 8Fifth 5 5 12 6Sixth 4 4 6 3Seventh 3 3 4 2
$ 10 income
UTILITY MAXIMIZING COMBINATION
Utility maximizing combination is 2 of Product A
and 4 of product B
Unit ofproduct
Product A:Price = $1
Product B:Price = $2
Marginalutility,utils
Marginalutility per
dollar(MU/price)
Marginalutility,utils
Marginalutility per
dollar(MU/price)
First 10 10 24 12
$ 10 income
UTILITY MAXIMIZING COMBINATION
Unit ofproduct
Product A:Price = $1
Product B:Price = $2
Marginalutility,utils
Marginalutility per
dollar(MU/price)
Marginalutility,utils
Marginalutility per
dollar(MU/price)
Utility Maximizing RuleThe consumer’s money should be spent so that the marginal utility per dollar of each goods equal each other.
MUx = MUyPx Py
Practice FRQ #4
UNIT 1 KEY CONCEPT
Absolute and Comparative Advantage
Output Questions:OOO=
Output: Other goes Over
Input Questions:IOU=
Input: Other goes Under
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