Suppose STC(Q) = 2Q + 20. Short run marginal cost is
A) indeterminate, since we don't know the level of $Q$
.
B) 22
C) 20
D) 2

Question

Suppose STC(Q) = 2Q + 20. Short run marginal cost is
A) indeterminate, since we don't know the level of $Q$
 .
B) 22
C) 20
D) 2

Quizplus · Accepted Answer

Short run marginal cost is the derivative of total short run cost with respect to quantity, which is the same as the derivative of STC(Q) with respect to Q. Taking the derivative of STC(Q) = 2Q + 20 yields a constant term of 20, which means the short run marginal cost is simply the coefficient of Q, which is 2. Therefore, the answer is D.

Suppose STC(Q) = 2Q + 20 QQQ B) 22 C) 20 D) 2

Suppose STC(Q) = 2Q + 20 $Q$
B) 22
C) 20
D) 2