A firm is currently producing 1140 units of output according to the pr

A firm is currently producing 1140 units of output according to the production function q = L4/3K1/2 and faces input prices equal to w = $20 and r = $80. In the short run, capital is fixed at 5 units. In the long run, the firm’s costs are

A) lower because the firm substitutes towards more labor and away from capital.
B) lower because the firm substitutes towards more capital and away from labor.
C) higher because the firm substitutes towards more labor and away from capital.
D) higher because the firm substitutes towards more capital and away from labor.

ANSWER

B