If all firms pay an efficiency wage, then A) there is no cost to shir

If all firms pay an efficiency wage, then

A) there is no cost to shirking because the shirking worker can receive his high wage at another firm after being caught and fired.
B) the macroeconomy would enjoy a prolonged period of near-zero unemployment.
C) there is a cost to shirking because the efficiency wage is less than it would have been if only a few firms paid it.
D) there is a cost to shirking because the shirking worker will spend a greater time unemployed after being caught and fired.

ANSWER

D