12. Using aggregate demand, short -run aggregate supply, and long - run aggregate supply curves, explain the process by which each of the following economic events will move the economy from one long -run macroeconomic equilibrium to another. Illustrate with diagrams. In each case, what are the short - run and long -run effects on the aggregate price level and aggregate output?

a. There is a decrease in households’ wealth due to a decline in the stock market.

b. The government lowers taxes, leaving households with more disposable income, with no corresponding reduction in government purchases.