Several years ago, a bookstore chain extended its closing time from 9 p.m. to 10 p.m. Now it is considering a further extension to 11 p.m. In making this marginal decision, the results of having gone from 9 p.m. to 10 p.m. are
A) no longer relevant to the current decision.
B) relevant if the marginal costs and benefits were unequal.
C) relevant since they are part of the calculation of total costs and benefits.
D) relevant if the marginal costs and benefits were equal.
A
Economics
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