ECON 103 Study Guide - Quiz Guide: Perfect Competition, Demand Curve, Cost Curve

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ECON 103 Full Course Notes

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Fall 2017 your section time and day: 103-02ak thursday 4:00pm. Class 13, quiz 11: to be done at home and handed in to ta section. Note that you may work with one other person from your ta section. Show the amount that a perfect competitor would produce and the price of output. The amount that a perfect competitor would produce is at the interection of mr and mc. The perfect competitor would produce . 31 and the output would be 6. The mr curve is below the demand curve because you always have to lower prices to sell more. The average total cost is above the mc curve because if mc was above atc, it drives down prices and mc. When mc is too high above atc, firms may think that they"re making a profit but they are really losing money overall because they"re selling at a price that is too low to cover their fixed costs.

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11.) Which statement is false?
A. The minimum point of the AVC curve is the shutdown point.
B. The minimum point of the ATC curve is the breakeven point.
C. The firm's short-run supply curve runs up the marginal cost curve from the shutdown point all the way up the curve.
D. None of these statements are false.
12.) Which statement is false?
A. The firm's short-run supply curve runs along the MC curve from the shutdown point to the break-even point.
B. The MC curve intersects the ATC curve at the latter's minimum point.
C. Total revenue = price x output sold.
D. None of these statements are false.

26.) If the price were $25, this firm would _______ in the short run and _______ in the long run.
A. shut down; stay in business
B. shut down; go out of business
C. operate; stay in business
D. operate; go out of business

22.) If price is above the break-even point, in the short run the firm will _____ and in the long run the firm will _____.
A. shut down; stay in business
B. shut down; go out of business
C. operate; go out of business
D. operate; stay in business

8.) Which statement is true?
A. Because they are the only seller in the industry, the monopolist does not have to lower their price to sell more output.
B. Most firms in the United States are monopolies.
C. Unlike the perfect competitor, the monopolist does not necessarily produce at that output where MC = MR.
D. None of these statements are true.

15.) In the United States, natural monopolies
A. are easily converted to competitive industries.
B. are common in retailing.
C. are commonly regulated by governments.
D. are rarely regulated by governments.

21.) If a monopoly firm can sell its eighth unit of output for a price of $175, it may expect to receive a price __________ in order to sell more than eight units.
A. of more than $175
B. of $175
C. of less than $175
D. of $100

27.) Which statement is true?
A. Since the monopolist is the only firm in the industry, its profit is calculated differently from the way a perfect competitor would calculate profit.
B. The monopolist's demand curve and marginal revenue curve are the same line.
C. In the long run under monopoly, the most efficient output is the most profitable output.
D. A monopolist may lose money in the short-run

A firm is producing where its marginal costs are at the lowest level. What can one most likely infer from this? a. there is either lost opportunity for further profits by producing more, or the firm should shut-down if it is competitive and price is at that low level. b. It is a price-taker who is producing too much. c. It is a monopolist who is producing the socially optimal quantity. d. The firm is producing rationally.

6. A single-price monopolist sets price a. where MR=demand. b. where supply=demand c. from the demand curve at the quantity for which MC=MR. d. where MR=MC.

7. Assume that the Law of Diminishing Marginal Product applies at the current output level of a competitive firm. The price is $20 and, at the current output level, marginal cost is $16 and average total cost is $20. To maximize profits the firm should: a. produce the current output level, since average revenue (price) = average cost. b. produce more since marginal revenue exceeds marginal cost at current output. c. produce less since marginal revenue is always below average revenue. d. any of the above is possible, without further information.

8. Which of the following statements is true? (i) When a competitive firm sells an additional unit of output, its revenue increases by an amount less than the price. (ii) When a monopoly firm sells an additional unit of output, its revenue increases by an amount less than the price. (iii) Average revenue is the same as price for both competitive and monopoly firms. a. (i) only b. (iii) only c. (i) and (ii) d. (ii) and (iii)

9. If a firm in a competitive market triples the number of units of output sold, then total revenue will a. more than triple. b. less than triple. c. exactly triple. d. All of the above are potentially true.

10. When a competitive firm makes a decision to shut down, it is most likely that a. marginal cost is above average variable cost. b. marginal cost is above average total cost. c. price is below the minimum of average variable cost. d. fixed costs exceed variable costs.

1. Suppose that a perfectly competitive firm's Total Cost function is given by:
TC = 50 + 80q - 10q² + 0.6q³
a. What is fixed cost equal to? What is Variable Cost equal to?
b. What is Marginal Cost equal to? What is the Average Variable Cost equal to?
c. Find an equation for the inverse supply curve of the firm. Hint: the supply curve presumes profit-maximizing outputs at any market price.
d. Below which market price (a number) will this firm choose to produce 0 output?
e. Choose a market price that is between Average Cost and Average Variable Cost. Will, the firm choose to produce a positive output level?
Depict this output level in a graph that includes all the
appropriate curves. Explain verbally (and with numbers) why this firm would choose to produce the output you chose.
f. What does it mean for a firm to be a price taker? What is the
implication of this for the individual firm's demand curve? You must also mention in your answer the term elasticity (correctly of course).
g. If the firm's cost curve shifted down, what would this do to?
the firm's supply curve? Justify your answer with an example using the short-run total cost curve above.
Q2. Suppose there are two demand curves (e.g two different sets of consumers) for a particular product (two distinct markets that can be segmented-so somehow the consumers in one market cannot buy in the other market and resale from lower-priced consumers to higher-priced consumers is not possible).
The two demand curves are given by the following equations:
Q1 = 14 - P1 (group 1)
Q2 = 12 - 2P2 (group 2)
a. Solve for the inverse demand curve for group 1 and then graph the inverse demand curve with P on the vertical and Q on the horizontal axis.
b. Calculate MR for each group above and graph on the graphs in part a.
c. Suppose MC=AC is constant and equal to 2 for the firm (So the MC curve applies for both groups (because it is the same supplier of a single product for the two groups), although demand and MR are unique to each group since the markets can be segmented. Find the profit-maximizing output, price, and profits in each market. You may assume that TC = AC*Q (cost per unit*number of units). Label the correct price and quantity for each graph in part a.
d. What are the elasticities at the profit-maximizing quantities that you found in part c?
e. Can you say anything about how the price charged in each market relates to the relative price elasticities of demand you calculated in part d? Try to explain intuitively using an example of a real product that you might consume, in which the supplier of a single product can segment the market and in fact charge different prices to two different groups.
f. Now suppose that the above firm cannot segment the two markets. Solve for the single profit-maximizing price and quantity. What are profits equal to?

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ECON 103 Study Guide - Quiz Guide: Perfect Competition, Demand Curve, Cost Curve

ECON 103 Full Course Notes

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