Figure 28-1
Suppose that the economy is currently at point A on the short-run Phillips curve in the
figure above, and the unemployment rate at A is the natural rate. If the economy was to
move to point B, which of the following must be true?
A) The economy is producing a level of GDP equal to potential GDP.
B) Aggregate demand must have increased.
C) Equilibrium GDP at point B must be below potential GDP.
D) The Fed conducted expansionary policy to cause the move.
E) The Fed purchased treasury bills to cause the move.
If the social cost of producing a good or service exceeds the private cost,
A) a positive externality exists.
B) the sum of consumer surplus and producer surplus is maximized.
C) the market achieves economic efficiency.
D) a negative externality exists.