14.2 Central Banks and Monetary Policy

The video illustrates expansionary policy using a money market diagram. An increase in the money supply (a rightward shift of the money supply curve) leads to a lower equilibrium interest rate and a higher quantity of money in circulation. This demonstrates how expansionary policy makes borrowing cheaper and boosts economic activity.

The video introduces central bank monetary policy and its operation in controlling the money supply and interest rates. It begins by discussing standing facilities, which allow commercial banks to borrow or deposit funds with the central bank overnight at a marginal lending rate or deposit rate, respectively. This mechanism enables commercial banks to manage their short-term liquidity needs.

The second tool discussed is the reserve requirement, which mandates the minimum amount of reserves (cash or liquid form) that a commercial bank must hold as a fraction of its total deposits. For example, if a customer deposits 100 euro and the reserve ratio is 10%, the bank must keep 10 euro as a reserve, typically held at the central bank.

Open market operations are the third tool, involving the buying and selling of government bonds in secondary markets. The central bank purchases bonds to inject cash into the banking system, increasing the money supply, or sells bonds to reduce the money supply. These transactions, often reverse agreements with a one-week maturity, directly impact bank reserves and their lending capacity.

Expansionary monetary policy involves the central bank purchasing government bonds from commercial banks. This injects cash into the banking system, increasing bank reserves and making them more liquid. Consequently, banks can increase their lending to borrowers, which leads to an increase in the money supply and a decrease in interest rates, thereby stimulating borrowing and expenditure in the economy.

Contractionary monetary policy is the opposite: the central bank sells government bonds to financial institutions. This reduces the reserves of commercial banks, as they use their cash to buy the bonds. With lower reserves, banks have less potential to lend, leading to a decrease in the money supply and an increase in interest rates, making borrowing more expensive and slowing down the economy.

Using the money market diagram again, a contraction in the money supply (a leftward shift of the money supply curve) results in a higher equilibrium interest rate and a lower quantity of money. This reflects that contractionary policy increases the cost of borrowing, which in turn discourages borrowing and reduces overall expenditure in the economy.