Which of the following is/are NOT price-setting oligopoly models?

The monopolist that maximizes profit

A) imposes a cost on society because the selling price is above marginal cost. B) imposes a cost on society because the selling price is equal to marginal cost. C) does not impose a cost on society because the selling price is above marginal cost. D) does not impose a cost on society because price is equal to marginal cost.

Figure 14-5

In , AD₁ and SRAS₁ indicate an economy initially operating at full-employment output level, Y₁. The short-run impact of the Fed unexpectedly shifting to a more restrictive monetary policy will be
a.
a decrease in aggregate demand to AD₂ and a decrease in real output to Y₂.
b.
a decrease in aggregate demand to AD₂ but real output would remain at Y₁.
c.
a decrease in aggregate demand to AD₂ and an increase in short-run aggregate supply to SRAS₂, causing the price level to fall to P₃ and real output to remain unchanged at Y₁.
d.
no change; AD and SRAS will stay at AD₁ and SRAS₁.