Monetary Policy and Bank Regulation
Summary :The Central Bank's Core Functions
A central bank is the institution responsible for conducting a nation's monetary policy and ensuring that its financial system operates smoothly. Central banks typically perform three core functions: conducting monetary policy, meaning managing interest rates and credit conditions to influence macroeconomic outcomes such as unemployment and inflation; promoting the stability of the financial system, so that a shock at one institution does not cascade into a broader crisis; and providing banking services to commercial banks and the government, including holding reserve accounts for commercial banks and processing payments between them. Money, loans, and banks form an interconnected system: households and firms deposit money in banks, banks lend a portion of those deposits to borrowers, and the resulting flow of credit supports spending and investment across the economy. When this system operates smoothly, savers are efficiently connected with borrowers; when it breaks down, the resulting disruption can push an economy toward recession or, in the opposite direction, toward persistent inflation.
Bank Regulation, Bank Runs, and Deposit Insurance
Bank regulation exists mainly to protect the solvency of individual banks and the integrity of the financial system as a whole, and it typically includes reserve requirements, capital requirements, and restrictions on the types of investments a bank may hold. Because a bank lends out most of the deposits it receives and keeps only a limited share on hand as reserves, banks are inherently vulnerable to a bank run, a situation in which many depositors try to withdraw their funds at once, often triggered by nothing more than a rumor that a bank might be in financial trouble; even a fundamentally healthy bank can be destroyed by a large enough run, since it simply does not hold enough cash on hand to satisfy every depositor simultaneously. To guard against this risk, most countries operate a deposit insurance system, under which a government-backed program guarantees that depositors will recover their money even if their bank fails, removing much of the incentive for depositors to panic and withdraw funds at the first sign of trouble. Regulators also conduct bank supervision, periodically examining a bank's financial health and requiring corrective action, or in severe cases forcing a sale or closure, when a bank's net worth turns dangerously low or its loan portfolio becomes excessively risky.
Open Market Operations
The most commonly used monetary policy tool is open market operations, in which a central bank buys or sells government bonds to change the level of reserves held by commercial banks, thereby influencing short-term interest rates and the overall money supply. Suppose a mid-sized regional bank called Northgate Bank holds a mix of reserves, government bonds, and loans on its balance sheet; if the central bank purchases a portion of Northgate's bond holdings, Northgate's reserves rise by that same amount, since the central bank pays for the bonds by crediting Northgate's reserve account. If Northgate wants to hold reserves at its usual level rather than an inflated one, it will lend out the newly received reserves, and as those loans are redeposited elsewhere in the banking system, the money multiplier effect spreads the impact of the original purchase across the wider economy, expanding the total money supply by a multiple of the initial injection. Selling bonds works in reverse: the central bank absorbs reserves from the banking system, banks have less to lend, and the money supply contracts. Because the central bank can create the funds it uses for these purchases, buying bonds is often described informally as the central bank creating money, though in practice it simply credits reserve accounts electronically rather than printing physical currency.
Reserve Requirements and the Discount Rate
A second monetary policy tool is changing the reserve requirement, the minimum percentage of deposits that banks must hold in reserve rather than lend out. Raising the reserve requirement forces banks to hold more in reserves and lend less, contracting the money supply, while lowering it frees up more funds for lending, expanding the money supply; because even small changes in the reserve requirement affect every bank in the system simultaneously and can be highly disruptive to normal bank operations, central banks tend to use this tool sparingly. A third tool is the discount rate, the interest rate a central bank charges when a bank borrows reserves directly from it, typically as a short-term measure to meet reserve requirements or cover an unexpected shortfall. Raising the discount rate discourages banks from borrowing reserves from the central bank, pushing them instead to call in loans or restrict new lending to maintain adequate reserves, which tightens the money supply and tends to raise market interest rates; lowering the discount rate works in the opposite direction. Together, open market operations, the reserve requirement, and the discount rate give a central bank three distinct levers for influencing how much credit is available throughout the banking system.
How Monetary Policy Affects Interest Rates and the Economy
Changes in bank reserves ultimately work through the market for loanable funds, the broader pool of savings available for borrowing across an economy. An expansionary monetary policy, which increases the supply of reserves and therefore the supply of loanable funds, tends to push the equilibrium interest rate down, making borrowing cheaper for businesses seeking to invest and households seeking loans for major purchases; a contractionary monetary policy works in reverse, reducing the supply of loanable funds and pushing the equilibrium interest rate up. When commentators describe a central bank as having raised or lowered interest rates, what is actually happening, more precisely, is that the central bank has changed the level of bank reserves through its policy tools, shifting the supply of loanable funds and moving market interest rates toward a new target. It is worth noting that a change in the specific short-term rate a central bank targets does not translate one-for-one into every other interest rate in the economy; a change in the targeted short-term rate typically has a smaller effect on longer-term rates, such as those on a multi-year business loan or a long-term mortgage, since those rates also reflect factors like the lender's assessment of risk over a much longer repayment horizon.
Quick Revision Summary
A central bank conducts monetary policy, promotes financial stability, and provides banking services to commercial banks and the government. Bank regulation, including reserve and capital requirements, exists to protect bank solvency, while deposit insurance and active bank supervision guard against the destructive potential of bank runs, in which many depositors attempt to withdraw funds simultaneously. Open market operations, the buying and selling of government bonds, are the most frequently used monetary policy tool, changing bank reserves and, through the money multiplier, the broader money supply. Changing the reserve requirement and changing the discount rate are two additional tools that a central bank can use, though both are typically applied more sparingly than open market operations. All three tools ultimately work by shifting the supply of loanable funds, which changes market interest rates and, through those interest rates, influences the level of borrowing, investment, and overall economic activity.