Micro Chapter 03

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Chapter 3

Where Prices Come From:The Interaction of Demand

and SupplySOLUTIONS TO END-OF-CHAPTER EXERCISES

Chapter 3

Answers to Thinking CriticallyQuestions

1. The iPhone is most likely a substitute for the iPod. Therefore, if a large number of consumers switchto the iPhone, the demand curve for iPods will shift to the left from D1 to D2. This will change the

equilibrium from A to B and reduce both the quantity and price. Someone may want to own both an

iPhone and an iPod if each product offered features not available on the other product, but owners of

the iPhone would most likely find little reason to also own an iPod.

2. Most customers would most likely see the iPhone as a closer substitute for other cell phones ratherthan other music players. The high price of the iPhone would probably not be attractive to people

who are strictly looking for a music player, which are generally much lower in price, but people may

be more willing to pay the higher price if they are also interested in the cell phone and other

telecommunications features of the iPhone.

LEARNINGOBJECTIVE


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CHAPTER 3 | Where Prices Come From: The Interaction of Demand and Supply44

LEARNING OBJECTIVE 3.1: Discuss the variables that influence demand.

Review Questions

1.1 A demand schedule is a table showing the relationship between the price of a product and the

quantity of the product demanded. A demand curve is a curve that shows the relationship between the

price of a product and the quantity of the product demanded.

1.2 Ceteris paribusmeans everything else equal that is, holding everything else constant when

examining the relationship between two variables.

1.3 A change in demand refers to a shift in a demand curve, while a change in the quantity

demanded refers to a movement along an unshifting demand curve.

1.4 The law of demand states that, holding everything else constant, when the price of a product falls,

the quantity demanded of the product will increase (and when the price of a product rises, the quantity

demanded of the product will decrease). The main variables that will cause a demand curve to shift

include: 1) changes in the prices of a related good substitutes or complements, 2) changes in income, 3)

changes in tastes, 4) changes in population or demographics, and 5) changes in expected future prices.

An example of substitute goods is Coke and Pepsi, and an example of complementary goods is hot dogsand hot dog buns. An example of a normal good may be a name brand product, like Coca Cola. An

example of an inferior good may be a store branded product, like Sams Choice Cola. An example of

changes in tastes would be organic produce becoming more popular. An example of changes in

population or demographics would be as the number of people over the age of 65 increases, demand for

health care services will increase. An example of changes in expected future prices would be if the prices

of hybrid vehicles are expected to come down in the future, todays demand will decrease.

Problems and Applications

1.5 a. substitutes

b. complements

c. complements

d. probably unrelated

1.6 Downloads of television programs may be complements to downloads of music if the programs

feature music the consumers wish to purchase. On the other hand, downloads of television programs are

likely to be substitutes for downloads of movies. If Apples main goal is to increase downloads of music,

they may choose to continue to offer downloads of television programs. If, on the other hand, they want

to expand movie downloads, they may discontinue downloads of television programs.

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CHAPTER 3 | Where Prices Come From: The Interaction of Demand and Supply 45

a. The demand curve for Big Macs will shift to the left fromD0toD1.

b. There will be a movement down the demand curve for Big Macs.

c. The demand curve for Big Macs will shift to the left (assuming that Big Macs and fries arecomplements) fromD0toD1.

d. The demand curve for Big Macs will shift to the right fromD1toD0.


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1.8 a. Music downloads, SAT test prep services, text messaging services

b. Diapers, developmental toys, child care services

c. Medical services, cruise ship tours, nursing homes

1.9 The data do not indicate that the demand curve for Explorers is upward sloping. It is likely that

factors such as income and the prices of other SUVs have changed during these three years. Therefore,

the data are likely to represent points from three different demand curves.

1.10 The accuracy of the forecast of iPhone sales depends on how easy consumers find the product isto use, the availability of substitute products, and by the compatibility of iPhones with other devices and

technologies that consumers use. The forecasts of iPhone sales are likely to be less accurate than those of

iPods because the iPhone is a new product in the market, so the response of consumers to it is more

difficult to predict.

LEARNINGOBJECTIVE

LEARNING OBJECTIVE 3.2: Discuss the variables that influence supply.

Review Questions

2.1 A supply schedule is a table that shows the relationship between the price of a product and the

quantity of the product supplied. A supply curve is a curve that shows the relationship between the price

of a product and the quantity of the product supplied.

2.2 The law of supply states that, holding everything else constant, an increase in price causes an

increase in the quantity supplied (and a decrease in price causes a decrease in the quantity supplied). The

main variables that will cause a supply curve to shift include: 1) changes in the prices of inputs used to make

the product, 2) technological changes, 3) changes in the prices of substitutes in production (other things that

the producers could be making), 4) changes in expected future prices, and 5) changes in the number of firmsin the market. Some examples: If the price of hybrid engines increases, the supply of hybrid vehicles will

decrease. If technology with respect to producing iPhones improves, the supply of iPhones will increase. If

Sony is producing both plasma and DLP flat screen televisions, and the price of DLP televisions increases,

supply of plasma televisions will decrease. If Toyota believes that the price of the Prius hybrid will be

increasing in the future, it will decrease todays supply and increase it in the future. As more firms enter theflat-screen television market, the supply of flat-screen televisions will increase.


2.3 a. Change in quantity supplied: A movement up the supply curve.

b. Change in supply: The supply curve shifts to the right.

c. Change in supply: The supply curve shifts to the left.

2.4 Not necessarily. Firms may have different costs of producing digital players and, therefore,

supply different quantities at the same price.

2.5 The increase in supply is likely to be larger the longer the time period being considered. Over

time, new firms can enter the market and existing firms can better adjust their mix of products by

increasing the quantity they supply of the good whose price has increased.


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LEARNINGOBJECTIVE

LEARNING OBJECTIVE 3.3: Use a graph to illustrate market equilibrium.

Review Questions

3.1 Market equilibrium is the situation in which the quantity demanded equals the quantity supplied.

3.2 If the current price is above equilibrium, the quantity supplied will be greater than the quantity

demanded, and there will be a surplus. A surplus causes the market price to fall toward equilibrium. If

the current price is below equilibrium, the quantity demanded will be greater than the quantity supplied,

and there will be a shortage. A shortage causes the market price to rise toward equilibrium.


3.3 Disagree. If there is a shortage, firms will raise the prices they charge. The quantity supplied will

increase, the quantity demanded will decrease, and equilibrium will be reached at a higher price.

3.4

3.5 Zero would be the equilibrium quantity if the lowest price at which anyone is willing to supply

the good is greater than the highest price that anyone is willing to pay for the good. In this case, the

demand curve will intersect the quantity axis at a quantity that is lower than the quantity where the supply

curve intersects the quantity axis. The quantity supplied and the quantity demanded will be zero in such a

market.

3.6 No. It only means that those willing to pay the market price received the goods. They would have

been happier paying less. And there are likely to be consumers who want the good but are not willing (orable) to pay the market price. Similarly on the supply side, sellers would be happier to sell at a higher

price, and there may be sellers who are only willing to sell at a higher price and, therefore, do not

participate in the market.


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LEARNINGOBJECTIVE

LEARNING OBJECTIVE 3.4: Use demand and supply graphs to predict changes in prices andquantities.

Review Questions4.1 When the demand curve shifts to the right, the equilibrium price and equilibrium quantity bothrise. The first graph below illustrates this case. When the supply curve shifts to the left, the equilibrium

price rises, but the equilibrium quantity falls. The second graph below illustrates this case.

4.2 If the demand curve shifts to the right more than the supply curve does, the equilibrium price willrise. Figure 3-11 (a) on page 85 of the text illustrates this case. If the supply curve shifts to the right

more than the demand curve, the equilibrium price will fall. Figure 3-11 (b) on page 85 of the text

illustrates this case.


4.3


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4.4 a. Complements

b.

4.5


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4.6

4.7 The quantity of flat screen televisions sold during this period must have increased.


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4.8 a.

b. Though we know the price has declined, we do not know if the quantity has increased or

decreased. This depends on the relative shifts in the demand and the supply curves.

4.9 Doubts about the safety of laser eye surgery will cause the demand curve to shift to the left, and

falling prices for eye surgery machinery will cause the supply curve to shift to the right. The equilibrium

price will definitely fall, but the equilibrium quantity may rise or fall depending upon the size of the shifts

in demand and supply. If the supply curve shifts right less than the demand curve shifts left, as shown in

the figure, the equilibrium quantity will fall. But if the supply curve shifts right more than the demand

curve shifts left, the equilibrium quantity will rise.


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4.10

4.11 Refrigeration allowed for the storage of perishable products. This removed some of the supply

during the peak season, shifting the supply curve to the left from S1to S2and driving the price up from P1to P2. During the off-season, the refrigerated supply could be offered for sale, shifting right the relatively

small supply from S3to S4and causing the price to fall from P3 to P4.

4.12 a. True

b. False (it depends on whether demand shifts more than supply)

c. False (the price will definitely decrease)

4.13 The students reasoning is incorrect. He should have said: Increased production leads to a lower

price, which increases the quantity demanded. There is a movement along the demand curve, but the

demand curve does not shift.

4.14 The students analysis is incorrect: the shift from D1 to D2 will not happen. There will be a

movement along the demand curve,D1, due to the price change, but the demand curve will not shift.


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4.15 Scenario a. is shown in the first graph demand for Pepsi rises because a decrease in the supply

of Coke will raise the price of Coke, which is a substitute for Pepsi.

Scenario b. is shown in the fourth graph demand for Pepsi falls when incomes fall because it is

a normal good.

Scenario c. is shown in the third graph an improvement in technology shifts the supply curve tothe right.

Scenario d. is shown in the second graph a rise in an inputs price shifts the supply curve to the

left.

4.16 The shift to the left of the U.S. supply curve from SUS1to SUS2increases the price from P1 to P2.

In the non-U.S. market, the demand rises from D1 to D2 because the price of a substitute (American-grown cotton) had risen. This causes the movement along the non-U.S. supply curve shown by the arrow.

(The prices of both types of cotton probably rose by about the same amount, if they were close

substitutes.)


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4.17 The rising costs will cause the supply curve to shift to the left, from S1 to S2, while the

improvement in quality will cause the demand curve to shift to the right from D1toD2. Because we dont

know if demand shifts to the right more than supply shifts to the left, we dont know if the equilibrium

quantity purchased will increase or decrease. If the shift in the supply curve is greater, as shown in the

figure, the equilibrium quantity will fall. We do know that the equilibrium price of childcare will rise as a

result of the regulation.

4.18 The graph with the vertical demand curve is more likely to represent the market for the life-

saving drug. If the price of this good rises, patients are unlikely to reduce the quantity they demand, but if

the price of the BMW rises, households will reduce the quantity they demand as they switch to buying

other luxury cars.

Micro Chapter 03

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