Final answer:
An increase in the price level, a decrease in investment, and a decrease in government purchases cause the aggregate demand curve to shift left. Conversely, a decrease in the price level, an increase in consumption, and a decrease in imports coupled with an increase in exports cause the aggregate demand curve to shift right.
Step-by-step explanation:
a. An increase in the price level will cause the aggregate demand curve to decrease and shift left. This is because as the price level increases, the purchasing power of consumers decreases, leading to a decrease in consumption spending and a decrease in aggregate demand.
b. A decrease in investment will cause the aggregate demand curve to decrease and shift left. This is because investment is one of the components of aggregate demand, and a decrease in investment means there is less spending in the economy.
c. If imports decrease and exports increase, it will cause the aggregate demand curve to increase and shift right. This is because an increase in exports means there is more spending from foreign countries, and a decrease in imports means there is less spending going out of the country.
d. A decrease in the price level will cause the aggregate demand curve to increase and shift right. This is because as the price level decreases, the purchasing power of consumers increases, leading to an increase in consumption spending and an increase in aggregate demand.
e. An increase in consumption will cause the aggregate demand curve to increase and shift right. This is because consumption is one of the components of aggregate demand, and an increase in consumption means there is more spending in the economy.
f. A decrease in government purchases will cause the aggregate demand curve to decrease and shift left. This is because government spending is one of the components of aggregate demand, and a decrease in government purchases means there is less spending in the economy.