Suppose that the position of a nation's long-run aggregate supply curve has not changed, but its long-run equilibrium price level has increased. Which of the following factors might account for this event? (See page 232.)
a. A rise in the value of the domestic currency relative to other world currencies
b. An increase in the quantity of money in circulation
c. An increase in the labor force participation rate
d. A decrease in taxes
e. A rise in real incomes of countries that are key trading partners of this nation
f. Increased long-run economic growth