ECN 302 Study Guide - So Wrong, Demand Curve, Marginal Product

Make sure you first review and understand all of the "shift factors" for the supply and demand curves in your textbook. I would have a list of these by my side as you read the article titled, "The Oil Conundrum." The later part of the article discusses some of the topics we will be learning about later this semester. You may also use the sort article, "Why Is Gas Still So Expensive in California?" Use both articles to identify how events discussed in the article are affecting supply AND demand for oil. Find three events that likely caused supply shifts and three events that likely caused demand for oil to shift. You will need to answer the following six times, three for demand and three for supply:

a. Event - Quote the article

b. Which determinant (shift factors), as discussed in chapter 3, are causing the supply or demand curve to shift given the event quoted?

c. Which direction will the curve shift.

d. Given the shift, what will happen to price, will it increase or decrease?

e. Given the shift, what will happen to quantity, will it increase or decrease?

Note that the terms IMF and GDP are the International Monetary Fund and Gross Domestic Product. The IMF is an international economic stability organization. GDP is a measure for the size of a country's economy.

Here's a hint where to find some examples in "The Oil Conundrum" article:

1st page, 1st and 2nd paragraph - Supply

2nd page, 4th paragraph - Supply

3rd page, 5th paragraph - Supply

4th page, 4th paragraph - Demand

6th page, 3rd paragraph - Demand

6th page, 4th paragraph - Demand

A change in demand for a given factor of production will not occurif:
Answer
A. the productivity of that factor increases.
B. there is a decrease in the price of a substitute factor.
C. the price of that factor falls.
D. the productivity of that factor decreases.

Question 2

In terms of contribution to total income, the single most importantfactor of production is:
Answer
A. labor.
B. entrepreneurship.
C. natural resources.
D. capital.

Question 3

The trade off between work and leisure underlying the supply oflabor involves the substitution effect and the:
Answer
A. complementary effect.
B. elasticity effect.
C. production effect.
D. income effect.

Question 4

(Exhibit: Marginal Revenue Product and Demand) If the product priceis $4 per unit and the price of the factor of production is $80 perunit, the profit-maximizing quantity of the factor is _______unit(s).
Answer
A. 1
B. 5
C. 7
D. 3

Question 5

In perfect competition:
Answer
A. MFCL is greater than the price of labor.
B. the supply curve of labor to the firm is a horizontalline.
C. MRPL equals the price of the good.
D. MFCL is less than the price of labor.

Question 6

An increase in the participation rate of women in the U.S. laborforce:
Answer
A. has shifted the supply curve of labor to the right.
B. has increased the demand for labor.
C. resulted in a faster increase in wages.
D. has shifted the supply of labor to the left.

Question 7

A firm's demand curve for labor is:
Answer
A. the downward-sloping portion of its marginal revenue productcurve.
B. the upward-sloping portion of its marginal revenue productcurve.
C. horizontal for the firm in perfect competition.
D. the downward-sloping portion of its marginal productcurve.

Question 8

Since the 1970s, wage rates in the United States have _______ more_______ than they did in the previous two decades.
Answer
A. decreased; slowly
B. decreased; rapidly
C. increased; rapidly
D. increased; slowly

Question 9

Which of the following statements is true?
Answer
A. If the MFCL = MRPL the firm should hire more labor.
B. If MFCL < MRPL the firm should hire more labor.
C. If MFCL > 0, the firm should shut down.
D. If the MFCL > MRPL the firm should hire more labor.

Question 10

A leftward shift in the labor supply curve would result if:
Answer
A. people have less nonlabor income.
B. transit costs to and from work decline.
C. the population increases.
D. people value leisure more highly.

Question 11

A firm is in equilibrium when the marginal factor cost is:
Answer
A. equal to the marginal revenue product.
B. less than the price of the factor.
C. equal to the average product.
D. greater than the average product.

Question 12

A leftward shift in the labor supply curve would result if:
Answer
A. transit costs to and from work increase.
B. people value leisure less highly.
C. the population increases.
D. people have less nonlabor income.

Question 13

(Exhibit: Wage Determination in Perfect Competition) Which of thefollowing statements is true?
Answer
A. The firm will hire L1 units of labor, as shown in Panel(a).
B. The individual firm is a wage setter.
C. The firm's MFC of labor is equal to the price of the firm'soutput.
D. Total employment is equal to L1, as shown in Panel (a).

Question 14

(Exhibit: Marginal Revenue Product and Demand) If the product priceis $2 per unit and the price of the factor of production is $20 perunit, the profit-maximizing quantity of the factor is _______units.
Answer
A. 6
B. 4
C. 8
D. 2

Question 15

(Exhibit: Marginal Revenue Product and Demand) Assume that theproduct price is $2 per unit, the price of the factor of productionis $40 per unit, and 8 units are being hired. Profit can bemaximized by hiring _______ unit(s).
Answer
A. 2 more
B. 1 more
C. 3 fewer
D. 1 fewer

Question 16

(Exhibit: Demand and Supply of Bricklayers in a PerfectlyCompetitive Labor Market) If the price for "bricks laid in thewall" by a bricklayer is $.10 a brick, the marginal product of thesecond bricklayer is _______ bricks.
Answer
A. 1,200
B. 1,400
C. 1,300
D. 1,500

Question 17

In a perfectly competitive labor market, each firm can hire:
Answer
A. larger quantities of labor at going market wages perworker.
B. all the labor it wants, but only by outbidding itscompetitors.
C. larger quantities of labor at rising wages per worker.
D. only a fixed amount of labor at the going wage.

Question 18

(Exhibit: Demand and Supply of Bricklayers in a PerfectlyCompetitive Labor Market) If the equilibrium wage in the market forbricklayers is $100 a day, but a minimum wage for bricklayers of$130 a day is set by the government:
Answer
A. 3 workers who otherwise would have been employed are nowunemployed.
B. the firm will shut down.
C. 6 workers will now be hired by the firm.
D. all bricklayers are better off.

Question 19

A factor demand curve will shift because of:
Answer
A. the proportion of the factor's cost relative to totalcost.
B. changes in technology.
C. the slope of the MP curve.
D. the elasticity of demand for the final product.

Question 20

Which of the following statements is true?
Answer
A. MFC = change in total cost/ change in the quantity of afactor.
B. MFC = the change in the quantity of a factor times the change inthe price of the factor.
C. MRPL = MC of the output.
D. MRPL = MPL x (P), where P is the price of labor.

_____ 1. Suppose you make silver jewelry. If the price of silver falls, we would expect you to:

a. be willing and able to produce less jewelry than before at each possible price.

b. be willing and able to produce more jewelry than before at each possible price.

c. face greater demand for your jewelry.

d. face a weaker demand for your jewelry.

_____ 2. If suppliers expect the price of their product to fall in the future, then they will:

a. increase supply (supply curve shifts out) now.

b. decrease supply (supply curve shifts in) now.

c. increase supply in the future, but not now.

d. decrease supply in the future, but not now.

_____ 3. Consider the market for portable air conditioners, initially in equilibrium. When a heatwave strikes, the equilibrium price:

a. increases and equilibrium quantity decreases.

b. decreases, and the equilibrium quantity increases.

c. and quantity both increase.

d. and quantity both decrease.

_____ 4. Buyers can buy all they want to buy and sellers can sell all they want to sell at:

a. prices at and above the equilibrium price.

b. prices at and below the equilibrium price.

c. prices above and below the equilibrium price, but not at the equilibrium price.

d. the equilibrium price, but not at prices above or below the equilibrium price.

_____ 5. The law of supply and demand states that:

a. demand and supply curves shift out as time goes by.

b. the price of a goodwill rise in response to excess demand for that good.

c. when the supply curve for good shifts, the demand curve for that good shifts in response.

d. the equilibrium price of goodwill be rising more often than it will be falling.

_____ 6. If Doritos and Cheetos are substitutes, a rise in the price of Cheetos will cause:

a. the equilibrium quantity of Doritos to fall and the price of Doritos to rise.

b. the equilibrium quantity and price of Doritos to rise.

c. the equilibrium quantity and price of Doritos to fall.

d. the equilibrium quantity of Doritos to rise and the price of Doritos to fall.

_____ 7. New production technology is perfected that allows auto manufacturers to build an automobile using half the labor hours formerly needed. As a result:

a. the equilibrium quantity of automobiles increases and the price decreases.

b. the equilibrium quantity and price of automobiles increase.

c. the equilibrium quantity and price of automobiles decreases.

d. there is likely no change in the number of automobiles produced.

_____ 8. The U.S. government announces that it will raise the interest rate on college student loans beginning in January of next year. The immediate market impact is:

a. the demand curve for student loans shifts out.

b. the supply curve for student loans shifts out.

c. we anticipate that more student loans will be completed next year than this year.

d. all of the above are correct.

_____ 9. What curve shift produces a fall in price and increase in quantity exchanged?

a. An inward shift in the demand curve.

b. An inward shift in the supply curve.

c. An outward shift in the supply curve.

d. An outward shift in the demand curve.

_____ 10. We note that fewer motorcycles were sold this year than last and that the price is also lower. What event could have caused this outcome?

a. A technological change that improved the fuel efficiency of motorcycles.

b. A rise in the wages paid to motorcycle manufacturing workers.

c. A motorcycle craze due to the popularity of Sons of Anarchy.

d. Increasing concerns about health impacts from breathing motorcycle exhaust.

_____ 11. The price that results in quantity supplied equaling quantity demanded is the optimal (best) price because it:

a. maximizes the combined welfare of buyers and sellers.

b. maximizes the cost of the seller.

c. minimizes the expenditure of buyers.

d. all of the above are correct.

_____ 12. Consumer surplus is the:

a. quantity of good consumers get without paying anything.

b. amount a consumer pays minus the amount the consumer is willing to pay.

c. amount a consumer is willing to pay minus the amount the consumer pays.

d. value of a good to a consumer.

_____ 13. In a market, the marginal buyer is the one:

a. whose willingness to pay is higher than all other buyers and potential buyers.

b. whose willingness to pay is lower than all other buyers and potential buyers.

c. who is willing to buy exactly one unit of the good.

d. who would be the first to leave the market if the price were any higher.

_____ 14. If a consumer is willing and able to pay $20 for a particular good and if she actually pays $16 for the good, then her consumer surplus is:

a. $4.

b. $16.

c. $20.

d. $36.

_____ 15. Suppose there is an early freeze in California that reduces the size of the orange crop. What happens to consumer surplus in the market for oranges?

a. Consumer surplus increases.

b. Consumer surplus decreases.

c. Consumer surplus is not affected by this change.

d. We would have to know whether the demand for oranges is elastic or inelastic.

_____ 16. Producer surplus is the area on a supply/demand graph:

a. under the supply curve.

b. between the supply and demand curves.

c. below the price line and above the supply curve.

d. under the demand curve and above the price line.

_____ 17. Economists typically measure economic efficiency using:

a. total producer and consumer surplus.

b. profits to firms.

c. the quantity supplied by sellers.

d. the price paid by buyers.

_____ 18. Which of the following statements is correct?

a. Efficiency and equality are both maximized when total surplus is maximized.

b. Efficiency deals with the size of the economic pie; equality with how fairly the pie is sliced.

c. Efficiency is more difficult to evaluate than equality.

d. Equality is judged on positive grounds; efficiency requires normative judgments.

_____ 19. The price elasticity of demand measures how much:

a. quantity demanded a response to changes in price.

b. quantity demanded a response to changes in income.

c. price responds to a change in demand.

d. Both a and c are correct

_____ 20. Goods with many close substitutes tend to have:

a. less elastic demands.

b. more elastic demands.

c. price elasticities of demand that are unit elastic.

d. income elasticities that are negative.

Short Answer Questions:

All of the following questions are based on the data shown here for coffee demand and supply at a fictional Columbus coffee shop called Go-bucks.

Price Quantity Quantity

per Cup Demanded Supplied

$1.60 1,700 1,220

$1.80 1,555 1,300

$2.00 1,400 1,400

$2.20 1,235 1,520

$2.40 1,060 1,660

$2.60 875 1,820

_____ 21. (6 points) Using the mid-point formula, calculate the price elasticity of demand as the price increases from $1.60 to $1.80.

_____ 22. (6 points) Repeat the calculation of the price elasticity of demand, this time for a price increase from $1.80 to $2.00.

_____ 23. (6 points) Repeat the calculation of the price elasticity of demand, this time for a price increase from $2.40 to $2.60.

24. (4 points) Over which price range is demand inelastic? Over which price range is demand elastic? Does this follow the trend noted in class?

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_____ 25. (6 points) Turning to the supply side, calculate the price elasticity of supply as the price increases from $2.20 to $2.40.

26. (2 points) How would you describe the price elasticity of supply over this range?

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