Many Stores Are Open 24 Hours a Day

Multiple Choice

Many stores are open 24 hours a day.When store managers make the decision to stay open 24 hours,it must be the case that

A) the marginal benefit of staying open all day and the marginal cost to remaining open all day are at least equal.
B) the marginal benefit of staying open all day must always be greater than the marginal cost to remaining open all day.
C) the marginal cost of staying open all day must always be greater than the marginal benefit to remaining open all day.
D) the calculation of marginal benefits or marginal costs of remaining open all day plays no role.
E) the marginal benefit of remaining open all day is zero.