7. There are 1,000 firms in a perfectly competitive market. Each faces the same short-run total cost function: SRTC = 50 + 10q + 5q². What is the minimum price at which a firm will stay open in the short run? a. P= $0 b. P = $5 c. P= $10 d. P = $20 e. P = $50

Figure 14-13 Suppose a firm in a competitive industry has the following cost curves: 10 9- 8 7. 6 اکیه 3.5 2 1- Price 1 2 3 4 MC 5 6 7 8 ATC AVC Refer to Figure 14-13. If the price is $2 in the short run, what will happen in the long run? ◆a. Individual firms will earn positive economic profits in the short run, which will entice other firms to enter the industry. b. Nothing. The price is consistent with zero economic profits, so there is no incentive for firms to enter or exit the industry. ● C. Individual firms will earn negative economic profits in the short run, which will cause some firms to exit the industry. d. Because the price is below the firm's average variable costs, the firms will shut down. 45

68. In a perfectly competitive market, industry demand is given by Q = 1000 – 20P. The typical firm’s average cost is TC = 300 + Q2 /3, and marginal cost by MC = (2/3)Q. What is the market price? A.$40 B. $32 C. $28.57 D. $30

Consider the following figure for a perfectly competitive firm in the short run. Price, Costs MC ATC AVC 30 26 20 12 ------ 10 ..---- .---- 8 12 21 30 32 40 Output Suppose the industry price is $20. If the firm produces its profit-maximizing or loss-minimizing output, then it will make a equal to Loss; $420 Profit ; $240 Loss ; $180 Loss; $240

1) The cost curves for a firm in a perfectly competitive industry are given below. Complete the table. If the firm operates in a perfectly competitive market, and the market price is $25 per unit, what Quantity should this firm produce at? TFC TC TVC AVC ATC MC TR S100 S100 1 S100 S130 2 S100 S150 S100 S160 S100 S172 5 S100 S185 6 S100 $210 S100 $240 S100 $280 S100 $330 10 S100 $390 Table 9.1

41 Output Total Total (Q) Price Revenue Cost 10 $12.00 $140 E of 20 $12.00 $220 30 $12.00 $380 40 $12.00 $620 The table above shows revenue and cost information at four different Output (Q) levels for a Perfectly Competitive firm in the short run. If the firm increases its Output from 30 to 40, Marginal Cost (MC) is. Select one: a. $12 b. $24 c. $160 d. $240

The graph contains the relevant cost curves for a perfectly (or purely) competitive firm. Move point A on the graph to the shutdown point. 1.000 MC 900 ATC In order for the firm to carn positive economic profits the price of the good must be above what value? B00 AVC 700 00 500 400 400 price of a good: $ 400.00 300 Incerrect 200 AFC What is the shutdown price for this firm? 100 400.00 100 200 300 400 500 000 700 B00 000 1,000 Quantity shutdown price: $ Incorrect

2. A firm sells its product in a perfectly competitive market where other firms charge a price of $80 per unit. The firm's total costs are CQ)=40+8Q+ 20%. a. How much output should the firm produce in the short run? b. What price should the firm charge in the short run? c. What are the firm's short-run profits? d. What adjustments should be anticipated in the long run?

ATC Price MC AVC 8. 7- 9. 10 11 12 13 Quantity The graph shows the cost curves of a firm in a competitive industry. The market price is $5. In the short run, the firm should Choose one: * A produce the output at which MR = MC and earn a profit. B. produce the output at which MR = MC and suffer a loss. O C. shut down the operation. 9 D. There is not enough information to answer the question. 1st attempt

3. A profit-maximizing firm is perfectly competitive and is at long-run equilibrium. The output of the firm is 200 units and the total revenue is $1,200.00.Based on the information given, which of the following applies for the firm? The firm's marginal cost is $4.00. The firm's marginal cost is $6.00 The firm's marginal cost is $7.00 The firm's marginal cost is $9.00