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ECON1101 Lecture Notes - Lecture 4: Apple Juice, Aggregate Supply, Aggregate Demand

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School
UNSW, UNSW Sydney
Department
Economics
Course
ECON1101
Professor
Alberto Motta

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Document Summary

Chapter 4: demand and supply: an equilibrium analysis: Let"s sa(cid:455) (cid:449)e ha(cid:448)e t(cid:449)o produ(cid:272)ers of apple jui(cid:272)e. ea(cid:272)h of the(cid:373) has differe(cid:374)t suppl(cid:455) (cid:272)ur(cid:448)es due to differences in their respective production processes. To find the aggregate supply curve (total supply for the economy), simply take a price, check how much each producer supplies at this price and then sum up these quantities. For the aggregate demand curve, the same concept applies (diagram below). The aggregate demand and supply is the horizontal sum of the individual demand and supply curves. Excess supply depicts a situation where the quantity supplied is larger than the quantity demanded. In this case, it is clear that suppliers are left without a buyer and thus, will lower the price to attract one. Excess demand depicts a situation where the quantity demanded is larger than the quantity supplied.

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Related Questions

Who bears the primary costs of a rent control program?

A. landlords
B. renters that get rent-controlled apartments
C. taxpayers
D.

the wealthy

Assume the demand for sushi is Qd = 180 - 3P, where Qd is quantity demanded and P = price in dollars. The supply of sushi is Qs = 80 + 5P, where Qs is quantity supplied (and P is, again, price in dollars). A price of $20 would result in:

A. Excess supply of 60
B. Excess supply of 120
C. Excess supply of 140
D. Excess demand of 140

US agricultural price supports are politically popular because

A. They have no adverse impacts
B. The US would have food shortages without them
C. The benefits accrue to a large number of voters and the costs are paid by a small number of voters
D.

The costs are spread out among millions of people

Assume the demand for sushi is Qd = 180 - 3P, where Qd is quantity demanded and P = price in dollars. The supply of sushi is Qs = 80 + 5P, where Qs is quantity supplied (and P is, again, price in dollars). What would be the equilibrium price?

A. $15.50
B. $12.50
C. $10
D.

$15

Price floors and ceiling prices:

A. cause the supply and demand curves to shift until equilibrium is established.
B. both cause surpluses.
C. interfere with the rationing function of prices.
D.

A change in the price of a good leads to a change in ________, which leads to a ___________

A. quantity supplied; shift of the supply curve
B. supply; shift of the supply curve
C. quantity supplied; movement along the supply curve
D.

When the supply of a product increases, this implies that

A. the price of the product first declined
B. more will be purchased at the same price
C. producers will be willing to accept a lower price for each unit sold
D. demand for the good must have increased
E.

producers will offer less for sale at each possible price

If there is a excess demand for product X:

A. fewer resources will be allocated to the production of this good.
B. the price of the product will rise.
C. the supply curve will shift to the left and the demand curve to the right, eliminating the shortage.
D.

the price of the product will decline.

Which of the following will occur when there is a simultaneous decrease in demand and a decrease in supply?

A. B and D both necessarily occur
B. An increase in equilibrium quantity
C. A and C both necessarily occur
D. An increase in price
E. A and D both necessarily occur
F. A decrease in price
G.

A decrease in equilibrium quantity

Velcro is becoming more and more popular for a variety of uses, including as fasteners for shoes. What should happen to the equilibrium price and quantity for shoelaces as a result?

A. Both price and quantity should decrease.
B. Price should increase and quantity decrease.
C. Both price and quantity should increase.
D. Price should decrease and quantity increase.
E.

Nothing.

If the government imposes a ceiling price on apartment rents, we would expect to observe all of the following except one. Which is the exception?

A. conversion of some apartment complexes to condos
B. a shortage
C. an increase in the number of new apartment complexes being built
D. lower maintenance of existing apartments
E. long waiting lists for apartment seekers

supply; movement along the supply curve

both cause shortages.

When demand for a good is very elastic, revenue ________ when the price falls.

(2)

An elasticity measure less than one means that demand is __________.

(3)

An elasticity measure greater than one means that demand is __________.

(4)

The Latin expression ceteris paribus means

having made all other necessary changes.

holding constant all other variables.

assuming all households have similar incomes.

given the level of income in the economy.

(5)

A variable measured in terms of money is called a ____________________.

real variable

nominal variable

macroeconomic variable

microeconomic variable

(6)

Which of the following is true about the importance of money in economics?

Money is important in both macroeconomics and microeconomics.

Money is important in macroeconomics but not microeconomics.

Money is important in microeconomics but not macroeconomics.

Money is not important in either microeconomics or macroeconomics.

(7)

What is the difference between normative and positive economics?

Positive economics is descriptive and predictive; normative economics is prescriptive.

Positive economics highlights the positive aspects of the economy; normative economics highlights the average features.

Positive economics studies the actions of individuals; normative economics studies the actions of households.

Positive economics is an applied social science; normative economics is a theoretical social science.

(8)

The slope of the demand curve is negative because

the quantity of a good demanded decreases as income declines.

the quantity of a good demanded increases as income declines.

the quantity of a good demanded increases as the price declines.

the quantity of a good demanded decreases as the price declines.

(9)

What is the result of an increase in the price of bread, a normal good?

The demand curve shifts to the right.

The demand curve shifts to the left.

The quantity demanded increases.

The quantity demanded decreases.

(10)

What is the effect on demand for bread when the price of bagels, a substitute for bread, rises?

The demand curve for bread shifts to the right.

The demand curve for bread shifts to the left.

The quantity of bread demanded increases.

The quantity of bread demanded decreases.

(11)

Which of the following would cause the supply curve for bread to shift inward?

An increase in the price of bread

An increase in the price of bagels

A decrease in the price of bread

An increase in the price of flour

(12)

An improvement in technology shifts the supply curve outward because

at every price, firms find producing the good to be more profitable.

the price of the good increases.

at every price, firms find producing the good to be less profitable.

the price of the good decreases.

(13)

Which of the following factors does not affect how much bread a baker is willing to produce?

The price of bread

The demand for bread

The cost of inputs

Technology

(14)

How do expectations of prices affect how much of a good producers are willing to sell?

Expectations of prices affect only demand, not supply.

Actual prices, not expectations of prices, affect supply.

If producers expect prices to fall in the future, they supply less at every price.

If producers expect prices to rise in the future, they supply less at every price.

(15)

When the price of a good is above equilibrium level,

the quantity demanded exceeds the quantity supplied.

the quantity supplied exceeds the quantity demanded.

the supply curve shifts to the left.

the supply curve shifts to the right.

(16)

At a price of P0 in the diagram below, which of the following statements is true?

Supply equals demand.

There is excess demand.

There is excess supply.

There is scarcity.

(17)

If demand for bread increases at every price, the equilibrium price of bread will

fall.

rise.

remain unchanged.

depend on income.

(18)

If the demand for bread declines, then

at the original equilibrium price, there is excess demand.

at the original equilibrium price, there is excess supply.

the supply curve shifts to the right.

the supply curve shifts to the left.

(19)

Peanut butter and jelly are complementary goods. When the price of peanut butter rises, the demand for jelly ________ and the price of jelly ________.

rises; falls

rises; rises

falls; rises

falls; falls

(20)

The measure of elasticity that economists use is

always a positive number.

always a negative number.

positive when demand is elastic and negative when demand is inelastic.

negative when demand is elastic and positive when demand is inelastic.

(21)

Which of the following formulas is the correct expression for the slope of a line?

(22)

Graphically how would an increase in income affect the demand for hamburgers?

The slope of the demand curve would increase.

The slope of the demand curve would decrease.

The demand curve would shift outward, parallel to the original demand curve.

The demand curve would shift inward, parallel to the original demand curve.

(23)

Given the equation P = $6.00 ? $.40Q, where P is the price of the good and Q is the quantity of the good demanded, how many units will this consumer demand if the price is $3.60?

1.44 units

3 units

3.6 units

6 units

(24)

Which of the following is true about unit elasticity?

Revenues remain unchanged when the price changes.

Elasticity of demand increases as one moves down the demand curve.

Elasticity of demand decreases as one moves down the demand curve.

The elasticity of demand is greater than one at every point along the demand curve.

(25)

Which of the following could be a determinant of the quantity demanded of a good?

The price of the good

The price of related goods

Income

Expectations about the future price of the product

All of the above

Taxation Question (SHOW ALL WORK)

Suppose that the demand curve (hundreds) for apples is given by Qd = 140 - 5P, where Qd is the number of pounds demanded per year and p is the price per pound. The supply of apples can be described by Qs = 40 + 5P, where Qs is the number of pounds provided.

What is the equilibrium price? (Hint: At the equilibrium, quantity demanded and quantity supplied are equal, Qd = Qs.)

What is the equilibrium quantity supplied and demanded?

Calculate the consumer surplus at the equilibrium price.

Calculate the producer surplus at the equilibrium price.

Calculate the total surplus at the equilibrium price.

Now suppose that the government imposes a tax of $8 per each pound sold, paid by the producers. In this case, what are the price and the consumer surplus?