AP Microeconomics : AP Microeconomics

Study concepts, example questions & explanations for AP Microeconomics

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Example Questions

Example Question #1 : Perfectly Competitive Labor Markets

A minimum wage for coal miners will likely result in:

Possible Answers:

Lower wages for coal miners

A decrease in the supply of coal miners

An increase in the demand for coal miners

A surplus of coal miners

A shortage of coal miners

Correct answer:

A surplus of coal miners

Explanation:

Imposing a minimum wage usually causes a price floor in the market. Thus, the labor market for coal miners will likely see a surplus, which typically occurs when there is a price floor. The price will be higher than the equilibrium, which means that the labor supply will be greater than demand.

Example Question #3 : Perfectly Competitive Markets

The following question is based on this table:

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What is the total variable cost of producing five goods?

Possible Answers:

Cannot be determined

Correct answer:

Explanation:

Variable costs associated with production are costs that change in proportion to the level of production. By contrast, fixed costs are costs that are not dependent on production level. Fixed costs and variable costs make up a good's total cost of production.

In this case, the total cost of producing zero units is 12. The total variable cost of producing zero units is 0, which means that 12 must be the fixed cost associated with producing this good.

The total cost of producing 5 units is 33. Since total costs subtracted by fixed costs equals its variable costs, the variable cost of producing 5 units must be 21.

Example Question #1 : Perfectly Competitive Labor Markets

If the total product of labor increases at an increasing rate, _________ .

Possible Answers:

marginal product of labor is increasing.

marginal product of labor is at its minimum.

marginal product of labor is decreasing.

marginal product of labor is constant.

marginal product of labor is at its maximum.

Correct answer:

marginal product of labor is increasing.

Explanation:

Marginal product of labor describes how the total product of labor changes when more labor is hired. If the total product of labor is rising as labor increases, then the marginal product of labor must be increasing.

Example Question #5 : Perfectly Competitive Markets

A perfectly competitive firm produces at its profit maximizing level. At this point, the marginal product of labor is 7 units per hour and wages are $14 per hour. Which of the following is true?

Possible Answers:

None of the other answers are correct.

The market price of the good is $3 per unit.

The cost of producing the good is $2 per unit.

The market price of the good is $2 per unit.

The cost of producing the good is $3 per unit.

Correct answer:

The market price of the good is $2 per unit.

Explanation:

To maximize profits, a perfectly competitive firm will hire until its marginal revenue of labor equals its marginal cost of labor. The marginal cost of labor equals the wage rate, which is $14 per hour.

The marginal revenue of labor is the marginal product of labor multiplied by the price of the good. Since the marginal product at the profit maximizing level is 7 units per hour, the market price of the good must be $2 (7 units multiplied by $2 equals $14).

Example Question #6 : Perfectly Competitive Markets

A food safety issue causes a temporary halt in the production of hot dogs at a significant number of firms. What is the expected effect on the equilibrium price and quantity for hot dog buns, assuming a perfectly competitive marketplace?

Possible Answers:

Price decreases, Quantity decreases

Price increases, Quantity decreases

Price increases, Quantity increases

No change

Price decreases, Quantity increases

Correct answer:

Price decreases, Quantity decreases

Explanation:

Hot dogs and hot dog buns are a model pair of complementary goods. Few people buy one without buying the other. You can graph the situation described using supply and demand curves for each market.

In the hot dog market, a significant decrease in supply will result in an inward shift of the supply curve which results in a higher price and fewer hot dogs being bought and sold.

The resulting effect in the market for hot dog buns, with fewer hot dogs being sold, is an inward shift in the demand curve, which results in a decrease in both the market price and quantity sold of hot dog buns.

Example Question #7 : Perfectly Competitive Markets

If there is a bumper crop in cotton the same year that it becomes very fashionable and consumers begin to demand it over other fabrics, what is the likely effect on the market price and quantity traded?

Possible Answers:

No change in Price, Quantity increases

Price increases, Quantity increases

Price decreases, Quantity increases

Price indeterminate, Quantity increases

Price increases, no change in Quantity

Correct answer:

Price indeterminate, Quantity increases

Explanation:

Graph supply and demand curves to represent the market for cotton. The changes described would result in an outward shift of both the supply and demand curves. The new equilibrium would clearly have an increase in the quantity traded, but the equilibrium price would depend on the slope of the curves. Therefore, without more information, the effect on the market price is indeterminate.

Example Question #8 : Perfectly Competitive Markets

Sugar can be refined from either sugar cane or sugar beets. Which of the following would result in an increase in the market price of sugar cane, assuming perfect competition?

Possible Answers:

A bumper crop of sugar beet

A sugar beet crop failure

Consumers start eating less refined sugar

A bumper crop of sugar cane

Correct answer:

A sugar beet crop failure

Explanation:

A sugar beet crop failure would result in an inward shift of the supply curve in the market for sugar beets, resulting in a higher equilibrium price.

Since sugar beets and sugar cane are substitutes, this would result in greater demand for sugar cane, which would result in a higher price for sugar cane as well.

Example Question #1 : Perfectly Competitive Output Markets

Sugar can be refined from either sugar cane or sugar beets. If there is a larger-than-expected harvest in BOTH sugar cane and sugar beets, what is the effect on the equilibrium price and quantity in the market for sugar cane?

Possible Answers:

Price indeterminate, Quantity decreases

Price decreases, Quantity indeterminate

Neither Price nor Quantity can be determined from the information given.

Price increases, Quantity increases

Price indeterminate, Quantity increases

Correct answer:

Price decreases, Quantity indeterminate

Explanation:

First, an increase in the supply of sugar beet results in a lower market price, and therefore lower demand for sugar cane, since they are substitutes. This translates into a lower market price and lower quantity traded for sugar cane.

Second, the increased supply of sugar cane would result in a lower market price and higher quantity traded in sugar cane. Therefore, the market price would definitely decrease, but the direction of the change in quantity cannot be determined.

Example Question #10 : Perfectly Competitive Markets

Compared to a perfectly competitive market, a monopolist produces...

Possible Answers:

Unable to determine from the information given.

less of a good and charges a lower price.

more of a good and charges a lower price.

more of a good and charges a higher price.

less of a good and charges a higher price.

Correct answer:

less of a good and charges a higher price.

Explanation:

As seen in the graph below, the monopolist faces a downward sloping marginal revenue curve that is steeper than the demand curve. The monopolist produces where MC = MR which results in a higher price and lower output compared to where the marginal cost curve meets the demand curve, which is where equilibrium would be in a perfectly competitive market.

Monopolist

 

Example Question #11 : Competition

If a monopolist's marginal cost curve shifts down, what is the expected effect on price and quantity of the monopolist's output?

Possible Answers:

Price decreases, Output increases

Price decreases, Quantity indeterminate

Price decreases, Output decreases

Price indeterminate, Quantity increases

Cannot determine either Price or Quantity.

Correct answer:

Price decreases, Output increases

Explanation:

 

Although the monopolist will not end up producing at the socially optimal level, the effect of the change described is very similar to a shift in the supply curve in a perfectly competitive market.

Starting with the graph below as a baseline, you can see that if the marginal cost curve shifts down, the monopolist will produce at a point further along the marginal revenue curve, which would correspond to a greater output at a lower market price.

Monopolist

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