"Input-Output" Macroeconomics Stresses That a Change in Nominal Aggregate Demand

Multiple Choice

"Input-output" macroeconomics stresses that a change in nominal aggregate demand ________ produces an equal-proportional change in every firm's marginal cost,so that firms should consider indexing their price to nominal aggregate demand a very ________ pricing strategy.

A) need not,safe
B) need not,risky
C) must,safe
D) must,risky