ECON 1 Lecture Notes - Lecture 15: Sunk Costs, Decision Rule, Perfect Competition

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27 Nov 2016

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Shutdown: a short-run (sr) decision not to produce anything because of market conditions. Exit: a long-run (lr) decision to leave the market. If shut down in sr, must still pay fc. Cost of shutting down: revenue loss = tr. Benefit of shutting down: cost savings = vc (firm must still pay fc) So, shut down if tr < vc. Divide both sides by q: tr/q < vc/q. So, firm"s decision rule is: shut down if p < avc. Def: sunk cost = a cost that has already been committed and cannot be recovered. Sunk costs should be irrelevant to decisions; you must pay them regardless of your choice. Fc is a sunk cost: the firm must pay its fixed costs whether it produces or shuts down. So, fc should not matter in the decision to shut down. Cost of exiting the market: revenue loss = tr.

Related Questions

Match the following.

constant-cost industry	A market structure in which a large number of firms sell a homogenous product or service with no restrictions on entry or exit and each firm is a price-taker.
increasing-cost industry	The demand facing a price-taking firm.
long-run equilibrium	A firm produces zero output but must still pay its fixed costs.
marginal revenue product	Price below which a firm shuts down in the short run.
perfect competition	All firms produce where price equals long-run marginal cost, and economic profits are zero.
perfectly elastic demand	Industry in which input prices rise as all firms in the industry expand output.
shut down	Industry in which input prices remain constant as all firms in the industry expand output.
the shut-down price	The additional revenue earned by hiring one more unit of a variable input.

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4. Decisions made âat the marginâ entail a choice based upon_____________ of a decision.

a. the additional benefits
b. the total costs
c. comparing the total benefits and costs
d. comparing the additional benefits and costs
5. 100 units of Good X are available but individuals desire 500units. ______________ will determine who attains Good X, and whodoes not.

a. A rationing device
b. Opportunity Cost
c. Utility
d. Natural Selection

6. Individuals will continue consuming so long as:

a. The price of a good continues to decrease
b. The marginal costs of consuming are outweighed by the marginalbenefits
c. The individual seeks additional utility
d. The individual is willing and able

8. If the cross-price elasticity of two goods is positive, thenthose two goods are
a. substitutes.
b. complements.
c. normal goods.
d. inferior goods.

11. The basic reason most supply curves are upward sloping isthat:

a. More firms are in the market, therefore more goods areproduced.
b. Because more quantity is being demanded, suppliers raise theprice.
c. Producers face higher opportunity costs when producing higherlevels of quantity, so they must receive a higher price.
d. Producers seek to maximize total revenue.

18. When the price of bubble gum is $0.60, the quantity demanded is500 packs per day. When the price falls to $0.50, the quantitydemanded increases to 900. The demand for gum would beconsidered:

a. inelastic.
b. elastic.
c. unit elastic.
d. perfectly inelastic.

20. Inefficient Production implies which of the following:

a. it is impossible to produce more of one good without producingless of another
b. there are too few resources
c. there are too many resources
d. it is possible to produce more of one good without producingless of another

21. Workers at a bicycle assembly plant currently make minimumwage. If the federal government increases the minimum wage by $1.00an hour it is likely that the

a. demand for bicycle assembly workers will increase.
b. supply of bicycles will shift to the right.
c. supply of bicycles will shift to the left.
d. firm must increase output to maintain profit levels.

24. Suppose at a price of $5 and at a price of $9, John purchases40 units of good X. Given this information, we know that Johnâsdemand for good X is
a. perfectly elastic at all prices.
b. inelastic at all prices.
c. unit elastic between the prices of $5 and $9.
d. perfectly elastic between the prices of $5 and $9.
e. perfectly inelastic between the prices of $5 and $9.

25. If the price of good A decreases by 10 percent and the quantitydemanded of good B decreases by 10 percent, this is evidence that Aand B are
a. substitute goods.
b. complement goods.
c. inferior goods.
d. normal goods.
e. not related.

6. For an individual to achieve consumer equilibrium when consumingtwo goods, A and B, the individual must satisfy the followingcondition:

a. TUA = TUB
b. TUA/PA = TUB/PB
c. MUA = MUB
d. MUA/PA = MUB/PB
e. MUA/PB = MUB/PA

7. Which of the following statements is correct regarding a firm'sdecision making?
a. The decision to shut down and the decision to exit are bothshort-run decisions.
b. The decision to shut down and the decision to exit are bothlong-run decisions.
c. The decision to shut down is a short-run decision, whereas thedecision to exit is a long-run decision.
d. The decision to exit is a short-run decision, whereas thedecision to shut down is a long-run decision.

Table 1

Output Total Cost
0 $20
1 $30
2 $41
3 $51
4 $65
5 $75
6 $84
7 $105

13. Refer to Table 1. The marginal cost of producing the fifth unitof output is
a. $55.00
b. $15.00
c. $9.00
d. $10.00

21. A perfectly competitive firm can produce its current level ofoutput at an average total cost of $10 and a marginal cost of $8.If the market price of the product is currently $8, what should thefirm do?

a. The firm should definitely shut down since average total costexceeds price.
b. The firm should shut down if average variable cost is $8 orgreater, but the firm should continue to produce the current levelof output if average variable cost is less than $8.
c. The firm should increase production in order to increaseprofit.
d. The firm should continue to produce, but it should decreaseproduction in order to increase profit.
24. In the long run all costs are variable. Thus, aprofit-maximizing firm may exit:

a. When Price < Average Total Cost
b. When Price > Average Total Cost
c. When Average Revenue > Average Fixed Cost
d. When Average Revenue > Marginal Cost

25. Marginal cost tells us the
a. value of all resources used in a production process.
b. marginal increment to profitability when price isconstant.
c. amount by which total cost rises when output is increased by oneunit.
d. amount by which output rises when labor is increased by oneunit.

26. For a perfectly competitive firm:
a. marginal revenue is equal to price.
b. price is equal to marginal cost at the output level thatmaximizes profit.
c. selling an additional unit of the good it produces increasestotal revenue by the price of the good.
d. a and b
e. a, b, and c

6. Power Printers Total Costs (per hour)

q TC

0 65

1 80

2 95

3 120

4 150

5 200

If the price of a printer is $50 in this perfectly competitive industry, what is the profit-maximizing rate of output?

7. Which of the following is NOT true in a perfectly competitive market?

a. There is free entry and exit into the industry.

b. Each firm produces a differentiated product.

c. Each firm faces a perfectly elastic demand curve.

d. Price is equal to marginal revenue at every output level for the firm.

8. A perfectly competitive firm should always continue to operate in the short run as long as:

a. P < ATC at the rate of output where MR = MC.

b. P < AVC at the rate of output where MR = MC.

c. MR > AVC at the rate of output where MR = MC.

d. MR > AFC at the rate of output where MR = MC.

9. A firm that makes zero economic profits:

a. Must eventually go bankrupt.

b. Should shut down.

c. Incurs a loss, but should not shut down.

d. Covers all its costs, including a provision for normal profit.

10. A monopoly firm is different from a competitive firm in that:

A. There are many substitutes for the monopolistâs product whereas the competitive firmâs demand curve is perfectly elastic.

B. The monopolistâs demand curve is perfectly inelastic, whereas the competitive firmâs demand curve is perfectly elastic.

C. The monopolist can influence the price in the market, whereas the competitive firm is a price taker.

D. All of the above

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ECON 1 Lecture Notes - Lecture 15: Sunk Costs, Decision Rule, Perfect Competition

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