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First, let's define the different types of monetary policies. - Expansionary Monetary Policy: This policy is implemented by a central bank to increase the money supply in the economy, typically to stimulate economic growth and combat inflation. - Tight Monetary Policy: This policy aims to reduce the money supply in an economy, typically to battle high inflation. Also known as contractionary monetary policy. - Contractionary Monetary Policy: Similar to the tight monetary policy, this policy aims to decrease the money supply, in order to control inflation during a period of high economic growth or an overheating economy. - Loose Monetary Policy: This policy is implemented to increase the money supply, typically during an economic downturn, in order to stimulate economic activity.

Expansionary monetary policy is implemented by actions such as lowering interest rates, purchasing government bonds, or decreasing reserve requirements for banks. This leads to an increase in the amount of money available for businesses and consumers. The increased money supply results in lower interest rates and increased investment in the economy. This, in turn, increases consumer spending. Consequently, aggregate demand (AD) increases.

Tight monetary policy is implemented by actions such as raising interest rates, selling government bonds, or increasing reserve requirements for banks. This leads to a decrease in the money supply in the economy. As a result, interest rates rise, making borrowing more expensive for businesses and consumers. Higher interest rates reduce business investment and consumer spending, both of which lead to a decrease in aggregate demand (AD).

Contractionary monetary policy is implemented in the same ways as tight monetary policy, through actions such as raising interest rates, selling government bonds, or increasing reserve requirements for banks. The effect on aggregate demand is also the same: a decrease in the money supply leads to higher interest rates, followed by reduced business investment and consumer spending, ultimately resulting in lower aggregate demand (AD).

Loose monetary policy is implemented using the same methods as the expansionary monetary policy, through actions such as lowering interest rates, purchasing government bonds, or decreasing reserve requirements for banks. The effect on aggregate demand is also similar: an increase in the money supply results in lower interest rates, increased business investment, and higher consumer spending, ultimately leading to an increase in aggregate demand (AD). In conclusion, expansionary and loose monetary policies increase aggregate demand by increasing money supply, lowering interest rates, and stimulating business investment and consumer spending. On the other hand, tight and contractionary monetary policies decrease aggregate demand by reducing the money supply, raising interest rates, and reducing business investment and consumer spending.