How would a contractionary monetary policy affect the exchange rate, net exports, aggregate demand, and aggregate supply?

Contractionary monetary policy is a policy used by central banks to reduce the money supply in the economy and increase interest rates. The central bank may use tools such as increasing the reserve requirements for banks, raising the interest rates, or selling government securities in the open market. The main goal of this policy is to reduce inflation and stabilize the economy by lowering the overall demand for goods and services.

When a central bank implements a contractionary monetary policy, it leads to an increase in domestic interest rates. As a result, foreign investors find the domestic currency more attractive due to higher returns on investments. Consequently, the demand for the domestic currency increases, leading to its appreciation in the foreign exchange market. In summary, a contractionary monetary policy causes an increase in the exchange rate.

An increase in the exchange rate due to contractionary monetary policy makes the domestic goods and services more expensive for foreign consumers. This results in a decrease in exports. Simultaneously, imports become relatively cheaper due to the appreciation of the domestic currency, which leads to an increase in imports. Overall, net exports (exports minus imports) will decrease as a result of the contractionary monetary policy.

Aggregate demand is the total demand for goods and services in an economy. It consists of consumption, investment, government spending, and net exports. When a contractionary monetary policy is implemented, interest rates increase, leading to a decline in consumption and investment due to higher borrowing costs. As we concluded in step 3, net exports also decrease. All these factors together lead to a decrease in aggregate demand. Note that the effect on government spending depends on fiscal policy decisions, and we don't have enough information to draw conclusions about it in this exercise.

Aggregate supply is the total output of goods and services produced in an economy. The impact of a contractionary monetary policy on aggregate supply can be ambiguous. On one hand, higher interest rates can lead to higher production costs due to increased borrowing costs for firms, which could reduce the aggregate supply. On the other hand, the appreciation of the domestic currency can lower the cost of imported inputs for production, potentially increasing the aggregate supply. The overall effect on aggregate supply will depend on the sensitivity of these two opposing forces in the specific economy in question. In conclusion, a contractionary monetary policy leads to an increase in the exchange rate, a decrease in net exports, and a decrease in aggregate demand. The impact on aggregate supply is ambiguous and depends on the specifics of the economy in question.