What is the Banking System and How Do Central Banks Work?
The banking system consists of two main layers: commercial banks (which take deposits, make loans, and provide everyday services) and the central bank (which regulates money supply, sets interest rates, and supervises the entire system). Together, they direct the flow of money through the economy and manage inflation and growth.
The banking system has two tiers: commercial banks (deposits, loans, services) and the central bank (controls money supply, sets policy rates, regulates other banks). Central banks stabilize the economy by adjusting interest rates and money supply.
- 1↓Central BankSets policy rate; controls money supply; regulates banks
- 2↓Commercial BanksAccept deposits from public; make loans to businesses and individuals
- 3↓BorrowersBorrow for cars, homes, business; pay interest to banks
- 4SaversDeposit money; earn interest; builds credit history
Step-by-step worked examples
You deposit $1,000 in a bank. The bank lends it to a business. What role does the central bank play?
Central bank sets policy rate → bank's borrowing cost determined Central bank regulates the bank to ensure safety Bank earns profit from interest margin (deposit rate vs loan rate)
If the central bank raises interest rates, what happens to your savings account and a mortgage?
Central bank raises policy rate → commercial banks raise all rates Your savings earn more (higher savings rate) Mortgage becomes more expensive (higher loan rate)
A bank takes in $10 million in deposits and lends out $9 million. What is its reserve?
Reserve requirement = deposits not lent out Reserve = 10M − 9M = 1M Reserve ratio = 1M / 10M = 10%
Flashcards
Quick quiz
Q1.If the central bank raises rates, the bank's cost of borrowing…
Q2.Commercial banks are required to hold reserves because…
Q3.Which best describes how deposits become loans?
Q4.A central bank's main tool to fight inflation is…
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Common mistakes
Thinking all money in banks is held as cash. — Correct: Banks lend out ~90% of deposits (keep ~10% reserve) to earn profit. Your money is loaned to others.
Confusing the central bank with commercial banks. — Correct: Central bank = government regulator (one per country). Commercial banks = private entities (many per country).
Thinking banks can lend without limits. — Correct: Banks must maintain reserves and meet capital requirements set by the central bank.
Not understanding interest rates trickle down through all borrowing. — Correct: Central bank rate → bank borrowing costs → loan/savings rates → your mortgage/savings.
FAQ
What is the banking system?
A system of commercial banks (private lenders) regulated by a central bank (government). Transfers money from savers to borrowers.
Why does a central bank exist?
To regulate money supply, control inflation, maintain financial stability, and set interest rates for the entire economy.
How do commercial banks make money?
From the interest spread: they pay depositors a lower rate and charge borrowers a higher rate. The difference is profit.
What happens if a bank fails?
Deposits are insured (up to limit) by government insurance. Central bank supervises banks to prevent failure.