A competitive firm's cost of producing q units of output is C = 18 + 4q + q^2 Its corresponding marginal cost is MC = 4 + 2q. a. The firm faces a market price p = $24. Create a spreadsheet with q = 0, 1, 2, ..... 15, where the columns are q, R, C, VC, AVC, MC, and profit. Determine the profit-maximizing output for the firm and the corresponding profit. Should the firm produce this level of output or should it shut down? Explain. b. Suppose the competitive price declines to p = $12. Repeat the calculations of part a. Should the firm shut down? Please show Excel formulas. Thanks!
(a)
R = p x q = $24 x q
C = 18 + 4q + q2
VC = 4q + q2
AVC = VC/q = 4 + q
MC = dC/dq = 4 + 2q
Profit = R - C
q | R | C | VC | AVC | MC | Profit |
0 | 0 | 18 | 0 | -18 | ||
1 | 24 | 23 | 5 | 5 | 5 | 1 |
2 | 48 | 30 | 12 | 6 | 7 | 18 |
3 | 72 | 39 | 21 | 7 | 9 | 33 |
4 | 96 | 50 | 32 | 8 | 11 | 46 |
5 | 120 | 63 | 45 | 9 | 13 | 57 |
6 | 144 | 78 | 60 | 10 | 15 | 66 |
7 | 168 | 95 | 77 | 11 | 17 | 73 |
8 | 192 | 114 | 96 | 12 | 19 | 78 |
9 | 216 | 135 | 117 | 13 | 21 | 81 |
10 | 240 | 158 | 140 | 14 | 23 | 82 |
11 | 264 | 183 | 165 | 15 | 25 | 81 |
12 | 288 | 210 | 192 | 16 | 27 | 78 |
13 | 312 | 239 | 221 | 17 | 29 | 73 |
14 | 336 | 270 | 252 | 18 | 31 | 66 |
15 | 360 | 303 | 285 | 19 | 33 | 57 |
Profit is maximized (= $82) when q = 10 units. At this output, AVC < Price ($14 < $24), so firm should continue to operate.
(b)
Price = $12 | ||||||
q | R | C | VC | AVC | MC | Profit |
0 | 0 | 18 | 0 | -18 | ||
1 | 12 | 23 | 5 | 5 | 5 | -11 |
2 | 24 | 30 | 12 | 6 | 7 | -6 |
3 | 36 | 39 | 21 | 7 | 9 | -3 |
4 | 48 | 50 | 32 | 8 | 11 | -2 |
5 | 60 | 63 | 45 | 9 | 13 | -3 |
6 | 72 | 78 | 60 | 10 | 15 | -6 |
7 | 84 | 95 | 77 | 11 | 17 | -11 |
8 | 96 | 114 | 96 | 12 | 19 | -18 |
9 | 108 | 135 | 117 | 13 | 21 | -27 |
10 | 120 | 158 | 140 | 14 | 23 | -38 |
11 | 132 | 183 | 165 | 15 | 25 | -51 |
12 | 144 | 210 | 192 | 16 | 27 | -66 |
13 | 156 | 239 | 221 | 17 | 29 | -83 |
14 | 168 | 270 | 252 | 18 | 31 | -102 |
15 | 180 | 303 | 285 | 19 | 33 | -123 |
In this case firm is making loss at every output level, and loss is minimized (= -$2) when q = 4 units. At this output, AVC < Price ($8 < $12), so firm should not shut down.
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