The values for the long-run ATC curves of three different firms are listed in the table below.
Quantity ATC 1 ATC 2 ATC 3
5 10 7 12
10 8 6 9
15 7 5 7
20 6 6 6
25 6 7 5
30 6 9 4
35 7 13 6
40 8 17 9
(a) Which firm faces the lowest minimum ATC?
(b) Which firm has the greatest minimum efficient scale?
(c) Which firm has the smallest economies of scale?