Deck 4: Demand and Supply

Question 1

Car insurance and cars are complements. If the price of car insurance increases, the

A) demand for cars increases.
B) demand for cars decreases.
C) quantity of cars demanded increases.
D) quantity of cars demanded decreases.
E) More information is needed to determine if the demand for cars increases or decreases.

Answer 1

demand for cars decreases.

Question 2

The law of demand implies that, other things remaining the same,

A) as the price of a cheeseburger rises, the quantity of cheeseburgers demanded decreases.
B) as the demand for cheeseburgers increases, the price of a cheeseburger falls.
C) as more people demand cheeseburgers, the quantity demanded increases.
D) as the price of a cheeseburger rises, the quantity of cheeseburgers demanded increases.
E) as income increases, the quantity of cheeseburgers demanded increases.

Answer 2

as the price of a cheeseburger rises, the quantity of cheeseburgers demanded decreases.

Question 3

There are five hundred buyers in the market for cheese. If we know each individual's demand curves, to find the market demand we must

A) add the prices that each buyer will pay at every quantity.
B) add the quantities that each buyer will purchase at every price.
C) give up because there is no way to find the market demand.
D) average the price each buyer is willing to pay for each given quantity.
E) multiply the price times quantity for each buyer and then add the resulting products together.

Answer 3

add the quantities that each buyer will purchase at every price.

Question 4

Which of the following results in a movement upward along the demand curve for movies?

A) An increase in income, assuming that movies are a normal good.
B) A decrease in the price of Netflix, a substitute for movies.
C) A decrease in income, assuming that movies are a normal good.
D) An increase in the price of movie tickets.
E) A decrease in the price of movie tickets.

Question 5

A demand schedule

A) shows the quantity demanded at one price.
B) is a graph showing a relationship between the quantity demanded and the price of a good.
C) shows that demand is on schedule.
D) shows how demand changes when the supply changes.
E) is a list of the quantities demanded at each different price when all other influences on buying plans remain the same.

Question 6

The price of cotton clothing falls. As a result,

A) the quantity demanded of cotton clothing decreases.
B) the demand for cotton clothing increases.
C) the demand for cotton clothing decreases.
D) the quantity demanded of cotton clothing increases.
E) both the demand for cotton clothing increases AND the quantity demanded of cotton clothing increases.

Question 7

A market is defined as

A) a physical place where people buy only goods.
B) any arrangement that brings buyers and sellers together.
C) a place where one good is bartered for another.
D) a physical place where people buy both goods and services.
E) a store where people buy physical goods.

Question 8

eBay

A) is not a market because buyers can buy from only one seller at any point in time.
B) will be considered a market when the Internet firms become profitable.
C) is a market because buyers and sellers are brought together to buy and sell.
D) cannot function as a market.
E) would be a market if there were only one physical location.

Question 9

Consider the market for smart phones. Which of the following shifts the demand curve rightward?

A) A decrease in the number of smart phone buyers.
B) An increase in the price of smart phones.
C) A decrease in the price of smart phones.
D) An increase in the supply of smart phones.
E) An increase in the price of land-line phone service, a substitute for smart phones.

Question 10

The law of demand refers to how

A) the price of the good changes when people's demand for the good changes.
B) demand changes when people's incomes change.
C) the quantity demanded changes when the demand for the good changes.
D) the quantity demanded changes when the price of the good changes.
E) demand changes when the prices of substitutes and complements change.

Question 11

Which of the following shifts the demand curve for movies leftward?

A) An increase in incomes, assuming movies are a normal good.
B) A decrease in the price of Netflix, a substitute for movies.
C) An increase in the price of movie tickets.
D) A decrease in the price of movie tickets.
E) An increase in movie star salaries.

Question 12

Consumers regard Dell computers and Apple computers as substitutes. If the price of a Dell computer decreases, the

A) demand for Apple computers decreases.
B) demand for Dell computers increases.
C) supply of Dell computers increases.
D) demand for Apple computers increases.
E) demand for Dell computers decreases.

Question 13

The market demand curve for mousetraps is

A) found by summing the prices of mousetraps at each quantity of mousetraps demanded by each buyer.
B) the horizontal sum of the individual demand curves for mousetraps of all the buyers.
C) found by summing the quantities of mousetraps demanded at each income level by each buyer.
D) Both answers B and C are correct.
E) Both answers A and C are correct.

Question 14

Petrol prices increase by 50 per cent and other things remain the same. As a result, there is

A) an increase in the demand for petrol.
B) a decrease in the quantity of petrol demanded.
C) a decrease in the demand for petrol.
D) no change in the quantity of petrol demanded.
E) More information is needed to determine if the demand for petrol increases or decreases.

Question 15

A change in the demand for apples could result from any of the following EXCEPT

A) increased preferences for fresh fruit consumption for health reasons.
B) a change in the number of buyers.
C) a change in income.
D) a change in the price of a banana.
E) a change in the price of an apple.

Question 16

The phrase 'a change in demand' most directly implies a

A) movement along a demand curve.
B) shift of the demand curve.
C) change in the quantity demanded of a good.
D) movement along the price curve.
E) movement along the quantity curve.

Question 17

The downward slope of a demand curve

A) shows that, as the price of a good rises, consumers increase the quantity they demand.
B) indicates how the quantity demanded changes when incomes rise and the good is a normal good.
C) indicates how demand changes when the price changes and the good is a normal good.
D) indicates how demand changes when incomes rise and the good is a normal good.
E) represents the law of demand.

Question 18

What is the 'quantity demanded'?

A) The amount of a good people are able and willing to buy during a specific time period and at a given price.
B) The maximum amount of a good that can be consumed during a specific time period.
C) The minimum amount of a good that people are willing to buy during a specific time period and at a given price.
D) The amount of a good people are able and willing to buy at all possible prices.
E) The amount of a good people desire.

Question 19

The market demand curve

A) cannot show a change in demand for a good.
B) is upward sloping.
C) is the vertical sum of individual demand curves.
D) cannot show how quantity demanded changes in response to a change in price.
E) is the horizontal sum of individual demand curves.

Question 20

Changes in which of the following factors do NOT shift the demand curve?

A) Buyers' incomes
B) The price of the good
C) The price expected in the future
D) The number of buyers
E) The price of a substitute good

Question 21

In the above figure, ________ will shift the demand curve from D to D1.

A) a fall in the cost of producing pizza
B) buyers' expectations that pizza will be less expensive next week
C) a scientific article published that demonstrates eating pizza is good for one's health
D) an increase in income if pizza is an inferior good
E) a decrease in the price of a sub sandwich, a substitute for pizza

Question 22

According to the figure above, which of the following events will increase the quantity demanded of bottled water?

A) A rise in the price of a fitness club membership.
B) A fall in the price of bottled water.
C) An increase in the number of buyers of bottled water.
D) A rise in the price of bottled water.
E) A fall in the price of soft drinks.

Question 23

The figure above shows the market for iPhones. Which of the following shifts the demand curve from D0 to D1?

A) An increase in people's incomes.
B) A requirement that all students at universities have an iPhone.
C) A decrease in the price of Zunes, a substitute for iPhones.
D) An increase in the price of iPhones.
E) A decrease in the price of iPhones.

Question 24

A scooter uses much less petrol than a car. Suppose the price of petrol rises substantially. Which of the figures above best illustrates how this change affects the demand curve for scooters?

A) Figure A only
B) Figure B only
C) Figure C only
D) Figure D only
E) Both Figure A and Figure D

Question 25

Scooters and bicycles are substitutes. Suppose the price of a bicycle falls. Which of the figures above best illustrates how this fall in price affects the demand curve for scooters?

A) Figure A
B) Figure B
C) Figure C
D) Figure D
E) None of the above answers is correct because the change in the price of a bicycle will affect the supply curve NOT the demand curve.

Question 26

A huge 50 per cent off sale on golf clubs is advertised for next week. What happens this week in the market for golf clubs?

A) The supply of golf clubs increases.
B) The demand for golf clubs decreases.
C) The supply of golf clubs decreases.
D) The demand for golf clubs increases.
E) The demand for and the supply of golf clubs decreases.

Question 27

The impact of an increase in the price of a particular good is illustrated as a

A) movement downward and to the right along its demand curve.
B) rightward shift in its demand curve.
C) leftward shift in its demand curve.
D) rightward shift in its demand curve AND a movement upward and to the left along its demand curve.
E) movement upward and to the left along its demand curve.

Question 28

In a recession, consumers have less income to spend. As a result, if dining out is a normal good, then which of the following would happen to the demand curve for dining out?

A) The demand curve would shift rightward.
B) The demand curve would not shift but the price of dining out would fall.
C) The effect on the demand curve is unknown.
D) The demand curve would not shift but the price of dining out would rise.
E) The demand curve would shift leftward.

Question 29

Which of the following increases the demand for a good?

A) A rise in the price of a complement.
B) A decrease in the number of buyers.
C) The expectation that future income will be higher.
D) A fall in the price of a substitute.
E) An increase in income, assuming the good is an inferior good.

Question 30

Consider the market for smart phones. Which of the following shifts the demand curve leftward?

A) An increase in the price of smart phones.
B) Studies showing that using smart phones can cause brain cancer.
C) A decrease in the quantity demanded of smart phones.
D) An increase in the services provided by smart phones, such as text messaging.
E) A decrease in the price of smart phones.

Question 31

In the above figure, the movement from point a to point b reflects

A) an increase in the number of people who eat pizza.
B) a decrease in the price of pizza.
C) an increase in the demand for pizza.
D) an increase in the price of the tomato sauce used to produce pizza.
E) a decrease in the number of firms producing pizza.

Question 32

A popular dinner among university students today is sushi, green tea and wasabi dip, so these foods are complements. If the price of green tea increases and the price of wasabi dip increases, what would be the effect on the demand for sushi at lunch?

A) The demand for sushi could increase or decrease.
B) The demand for sushi would increase.
C) The demand for sushi would be unaffected, but the price would increase.
D) The demand for sushi would decrease.
E) The demand for sushi would be unaffected, but the price would decrease.

Question 33

The graph illustrates the demand for peanuts. Peanuts are a normal good because

A) the demand curve shows that, if the price of peanuts rises, there is a movement along the demand curve to a lower quantity demanded.
B) peanuts have both substitutes and complements.
C) the demand for peanuts increases when the price of one of its substitutes rises.
D) the demand curve for peanuts slopes downward.
E) the demand for peanuts increases when income increases.

Question 34

Two minute noodles are a staple food item for many university students. Two minute noodles are very inexpensive, easy to prepare, and can be combined easily with other foods. After students graduate, find employment and earn a higher income, they decrease their two minute noodle purchases significantly. In this case, two minute noodles are

A) a substitute good.
B) a complement for higher-income people.
C) an inferior good.
D) a normal good.
E) None of the above answers is correct.

Question 35

What happens to the demand for a good if a complement's price increases?

A) The demand decreases and the demand curve shifts rightward.
B) The demand increases and the demand curve shifts leftward.
C) The demand increases and the demand curve shifts rightward.
D) The demand decreases and the demand curve shifts leftward.
E) There is no impact on demand for the good and the demand curve does not shift.

Question 36

Scooters are a normal good and buyers' incomes decrease. Which of the figures above best illustrates how this change affects the demand curve for scooters?

A) Figure A
B) Figure B
C) Figure C
D) Figure D
E) None of the above answers is correct because the decrease in income will affect the supply curve NOT the demand curve.

Question 37

If the demand for digital cameras increases when consumers' incomes rise, then digital cameras are

A) an inferior good.
B) a normal good.
C) made using advanced technology.
D) a substitute for camcorders.
E) a complement to camcorders.

Question 38

In the above figure, the shift in the demand curve from D to D1 can be the result of

A) an increase in the price of soft drinks, a complement to pizza.
B) an increase in the price of pizza.
C) a change in quantity demanded.
D) an increase in the price of a sub sandwich, a substitute for pizza.
E) a decrease in income if pizza is a normal good.

Question 39

The figure above shows the market for iPhones. Which of the following creates a movement from point A to point B?

A) A decrease in the price of Zunes, a substitute for iPodsiPhones.
B) An increase in people's incomes.
C) A decrease in the price of iPodsiPhones.
D) An increase in the price of iPodsiPhones.
E) A requirement that all students at universities have an iPodiPhone.

Question 40

If macaroni and cheese is an inferior good, then a decrease in income results in

A) a decrease in the demand for macaroni and cheese.
B) a decrease in the supply of macaroni and cheese.
C) an increase in the demand for macaroni and cheese.
D) an increase in the supply of macaroni and cheese.
E) Both answers A and D are correct.

Question 41

Soft drinks and peanuts are complements. Other influences on buying plans remaining the same, a rise in the price of soft drinks

A) decreases the demand for soft drinks.
B) increases the demand for peanuts.
C) increases the demand for soft drinks.
D) decreases the demand for peanuts.
E) has no effect on the demand for peanuts, though it does change the quantity demanded of peanuts.

Question 42

The graph illustrates the demand curve for soft drinks. After a rise in the price of a soft drink from $1.00 a can to $2.00 a can, the quantity of soft drinks demanded

A) decreases from 1 can to 0 cans a day.
B) remains unchanged.
C) increases from 0 cans to 2 cans a day.
D) decreases from 2 cans to 0 cans a day.
E) cannot be determined from the figure because the demand curve will shift to a new curve.

Question 43

Assume that pizza and tacos are substitutes, and the price of a pizza increases. Which of the following correctly indicates what happens?

A) The demand for pizza decreases and the demand for tacos increases.
B) The quantity of tacos demanded increases and the quantity of pizza demanded decreases.
C) The quantity of pizza demanded decreases and the demand for tacos increases.
D) The demand for each decreases because both are normal goods.
E) The demand for both goods decreases.

Question 44

An increase in the number of fast-food restaurants

A) increases both the demand and supply of fast-food meals.
B) increases the supply of fast-food meals.
C) increases the demand for fast-food meals.
D) increases the demand for substitutes for fast-food meals.
E) raises the price of fast-food meals.

Question 45

A decrease in the price of a complement in production leads to

A) an increase in the supply of the good in question.
B) an increase in the supply of the good in question and a decrease in the quantity supplied of the good in question.
C) a decrease in the quantity supplied of the good in question.
D) a decrease in the supply of the good in question.
E) no change in the supply of the good in question.

Question 46

A normal good is DEFINED as a good

A) for which demand increases when the price of a complement falls.
B) for which demand increases when income increases.
C) with a downward-sloping demand curve.
D) for which demand increases when the number of demanders increases.
E) for which demand increases when the price of a substitute rises.

Question 47

Teenagers drink more soft drinks than other age groups. If the number of teenagers increases, everything else remaining the same,

A) market demand for soft drinks decreases.
B) market demand for soft drinks does not change.
C) there is a movement along the market demand curve for soft drinks.
D) market demand for soft drinks increases.
E) None of the above answers is correct because the effect on demand depends whether the supply curve shifts rightward, leftward or not at all.

Question 48

Which of the following increases the quantity supplied of compact discs, but does NOT increase the supply of compact discs?

A) A decrease in the number of suppliers of compact discs.
B) An increase in the price of the resources used to produce compact discs.
C) New technology that lowers the cost of producing compact discs.
D) A decrease in the price of a compact disc.
E) An increase in the price of a compact disc.

Question 49

Milk can be used to produce cheese or butter. If the price of a kilogram of butter rises, what happens to the supply of cheese?

A) The supply of cheese could increase, decrease or stay the same depending on what happens to the supply of butter.
B) The supply of cheese stays the same, and there is no change in the quantity supplied of cheese.
C) The supply of cheese increases.
D) The supply of cheese decreases.
E) The supply of cheese stays the same, and there is a decrease in the quantity supplied of cheese.

Question 50

Which of the following does NOT increase the supply of personal computers, that is, does NOT shift the supply curve of personal computers?

A) An increase in the number of firms producing personal computers.
B) A change in the expected future price of a personal computer.
C) A fall in the cost of the components used to assemble personal computers.
D) A rise the price of a personal computer.
E) An advance in the technology used to produce personal computers.

Question 51

The quantity supplied of a good or service is the

A) list of all quantities at different prices, as illustrated by a demand schedule and a demand curve.
B) quantity consumed at one price
C) one quantity produced at a variety of prices.
D) list of all quantities at different prices, as illustrated by a supply schedule and a supply curve.
E) quantity produced at one price.

Question 52

If the Motor Vehicle Builders' Union successfully negotiates a wage increase for its members, how does the wage hike affect the supply of cars?

A) The quantity supplied decreases.
B) The supply increases.
C) The supply decreases.
D) The quantity supplied increases.
E) Both answers B and D are correct.

Question 53

Which of the following results in a movement upward along the supply curve for movies in cinemas?

A) A decrease in the price of downloaded movies.
B) An increase in the number of cinemas.
C) An increase in the price of movie tickets.
D) A decrease in the price of movie tickets.
E) A decrease in movie star salaries.

Question 54

The law of supply reflects the fact that

A) suppliers have an incentive to use their resources in the way that brings the biggest return.
B) people buy more of a good when its price falls.
C) businesses can sell more goods at lower prices.
D) higher prices are more attractive to consumers because they signal a higher quality product.
E) the demand curve is downward sloping.

Question 55

A supply curve

A) slopes upward.
B) is a graph of the relationship between the quantity supplied of a good and its price.
C) slopes downward.
D) Both answers A and B are correct.
E) Both answers A and C are correct.

Question 56

The Motor Vehicle Builders' Union bargained for higher wages and more benefits for its members. As a result of the higher wages and increased benefits,
i. the quantity of new cars supplied decreases.
ii. the supply of new cars decreases.
iii. the supply of new cars increases.

A) only i
B) only ii
C) only iii
D) both i and ii
E) Neither i, ii nor iii is correct.

Question 57

The law of supply states that, other things remaining the same,

A) if the price of a good increases, firms buy less of it.
B) demand increases when supply increases.
C) if the price of a good increases, the supply increases.
D) as people's income increases, the supply of goods increases.
E) if the price of a good increases, the quantity supplied increases.

Question 58

To be part of the supply for a good, a producer must be

A) both able and willing to supply the good.
B) both able and willing to supply the good, and have already sold the good.
C) only willing to supply the good.
D) only able to supply the good.
E) both able and willing to supply the good, and have already identified a buyer.

Question 59

It is expected that the price of a tonne of wheat will increase in one month. This belief will result in

A) an increase in the current supply of wheat.
B) no change in the current or future supply of wheat.
C) an increase in the current quantity supplied of wheat.
D) a decrease in the future supply of wheat.
E) a decrease in the current supply of wheat.

Question 60

Which of the following increases the supply of a product?

A) Some producers going bankrupt and leaving the industry.
B) Lower prices for the resources used to produce the product.
C) A decrease in productivity.
D) An increase in the expected future price of the product.
E) A higher price for the product.

Question 61

The graph illustrates the supply of sweaters. Which of the following events will increase the quantity supplied of sweaters?

A) A decrease in the number of sweater buyers.
B) A rise in the price of a sweater.
C) An increase in the number of sellers of sweaters.
D) A rise in the expected future price of a sweater.
E) A rise in the wage rate paid to the workers who make sweaters.

Question 62

Wheat is used to produce cereal. When the price of wheat falls, the

A) supply of wheat decreases.
B) demand for wheat increases.
C) demand for cereal increases.
D) demand for cereal decreases.
E) supply of cereal increases.

Question 63

An increase in the number of pineapple growers results in

A) no change in the supply of pineapples and a movement along the supply curve of pineapples.
B) an increase in the supply of pineapples and a leftward shift in the supply curve of pineapples.
C) an increase in the supply of pineapples and a rightward shift in the supply curve of pineapples.
D) an increase in the quantity of pineapples supplied and no shift in the supply curve of pineapples.
E) None of the above answers is correct.

Question 64

Researchers have found a hybrid of corn that is cheaper to grow. This technological breakthrough

A) increases the demand for corn.
B) decreases the supply of corn.
C) increases the supply of corn.
D) Both answers A and C are correct.
E) Both answers A and B are correct.

Question 65

In the above figure, an increase in productivity

A) shifts the supply curve from S to S₂.
B) results in a movement from point b to point a.
C) shifts the supply curve from S to S₁.
D) results in a movement from point a to point b.
E) has no effect.

Question 66

If a higher price for wheat decreases the quantity of corn being produced, which of the following describes what has occurred?

A) The quantity of wheat supplied increased and quantity of corn supplied decreased.
B) The supply of wheat increased and the quantity of corn supplied decreased
C) The supply of wheat increased and the supply of corn decreased.
D) The supply of wheat decreased and the supply of corn decreased.
E) The quantity of wheat supplied increased and the supply of corn decreased.

Question 67

One reason supply curves have an upward slope is because

A) a higher price brings a greater profit, so firms want to sell more of that good.
B) increased supply will require increased technology.
C) to have more of the good supplied requires more firms to open.
D) people will pay a higher price when less is supplied.
E) None of the above answers is correct because supply curves have a downward slope.

Question 68

The above figure illustrates the market for corn. If point 'a' represents the original equilibrium and point 'b' the new equilibrium, which of the following could have caused the change?

A) An increase in the number of corn growers.
B) An increase in the cost of the fertiliser used to grow the corn.
C) An increase in the price of wheat, a substitute in production for corn.
D) An increase in income if corn is a normal good.
E) A belief among corn farmers that the price of a tonne of corn will be higher next month.

Question 69

Advances in productivity increase supply because they might

A) raise the prices of resources used to produce the good.
B) increase the price expected in the future.
C) decrease the number of goods available.
D) increase the number of firms producing the good.
E) decrease the cost of production.

Question 70

A rise in the price of a substitute in production for a good leads to

A) a decrease in the quantity of that good supplied.
B) an increase in the supply of that good.
C) no change in the supply of that good; instead there is a change in the quantity supplied.
D) no change in either the supply or the quantity supplied of the good.
E) a decrease in the supply of that good.

Question 71

In the above figure, an increase in cost of the cheese used to produce pizza

A) results in a movement from point b to point a.
B) results in a movement from point a to point b.
C) shifts the supply curve from S to S₂.
D) shifts the supply curve from S to S₁.
E) has no effect.

Question 72

Suppose over the next few years the productivity of firms producing electric cars improves dramatically. The advance in productivity leads to

A) an increase in the supply electric cars so that the supply curve shifts rightward.
B) a decrease in the supply of electric cars so that the supply curve shifts rightward.
C) a decrease in the supply of electric cars so that the supply curve shifts leftward.
D) an increase in the supply of electric cars so that the supply curve shifts leftward.
E) no change in the supply of electric cars, only a change in the quantity supplied of electric cars.

Question 73

Which of the following leads to an increase in the quantity supplied, but not an increase in supply?

A) An advance in the technology used to produce the good.
B) An increase in the product's price.
C) A decrease in the costs of production.
D) An increase in the price of another product that the suppliers can produce.
E) An increase in the number of firms producing the good or service.

Question 74

In the above figure, the shift in the supply curve from S to S₁ reflects

A) an increase in the quantity of pizza supplied.
B) a decrease in the supply of pizza.
C) an increase in the supply of pizza.
D) a decrease in the quantity of pizza supplied.
E) None of the above answers is correct.

Question 75

The above figure illustrates the market for corn. If point 'a' represents the original equilibrium and point 'b' the new equilibrium, which of the following could have caused the change?

A) An increased belief among buyers that corn is healthy.
B) A decrease in buyers' incomes if corn is an inferior good.
C) A decrease in the price of wheat, a substitute in production for corn.
D) A decrease in the number of corn growers.
E) An increase in the cost of the seed used to grow the corn.

Question 76

The quantity supplied of a good is

A) always larger than the quantity demanded at each price.
B) equal to the difference between the quantity available and the quantity desired by all consumers and producers.
C) the same thing as the quantity demanded at each price.
D) the amount that the people are willing and able to sell during a given time period at a specified price.
E) the amount the firm will sell when it can sell all it wants.

Question 77

Which of the following shifts the supply curve for oranges?

A) An increase in the number of orange consumers.
B) Disastrous weather that destroys about half of this year's orange crop.
C) A newly discovered increase in the nutritional value of oranges.
D) An increase in income for all orange consumers if oranges are a normal good.
E) An increase in the price of bananas, a substitute in consumption for oranges.

Question 78

The above figure illustrates the market for corn. If point 'a' represents the original equilibrium and point 'b' the new equilibrium, which of the following could have caused the change?

A) An increase in consumers' preferences for corn.
B) An increase in the labour costs of producing corn.
C) An increase in consumers' income if corn is a normal good.
D) An improvement in the technology of producing corn.
E) An increase in consumers' income if corn is an inferior good.

Question 79

In the above figure, the movement from point a to point b reflects

A) an increase in the number of producers of pizza.
B) a decrease in the cost of the tomato sauce used to produce pizza.
C) a decrease in income if pizza is a normal good.
D) an increase in the supply of pizza.
E) an increase in the price of pizza.

Question 80

In the above figure, the shift in the supply curve from S to S₂ reflects

A) a decrease in the supply of pizza AND a simultaneous decrease in the quantity of pizza supplied.
B) a decrease in the quantity of pizza supplied.
C) an increase in the quantity of pizza supplied.
D) an increase in the supply of pizza.
E) a decrease in the supply of pizza.