Lesson 62 - How Banks Create Money
Most people believe banks only lend out money they already have. In reality, banks create new money every time they make a loan. This process is called fractional reserve banking. Understanding how banks expand the money supply is critical for seeing how modern economies function and why central banks matter.
The basics of money creation
When you deposit €1,000 into a bank, the bank does not lock it in a vault waiting for you. Instead, it keeps a fraction in reserve and lends the rest out. If the reserve requirement is 10 percent, the bank keeps €100 and lends €900. The borrower spends that €900, and whoever receives it deposits it in another bank. That bank then keeps 10 percent (€90) and lends €810. This cycle repeats. Your original €1,000 deposit can support several thousand euros of new deposits and loans. Banks have effectively created new money.
Why this works
The system relies on trust. Not everyone withdraws deposits at once. As long as withdrawals are predictable, banks can safely lend out the majority of deposits. Central banks stand behind commercial banks as lenders of last resort, adding a safety net. This structure supports credit expansion and economic growth, but also introduces risks when lending gets excessive.
Table: Example of deposit expansion
Correct chart: growth of money from deposits
The chart shows how an initial €1,000 deposit expands into new money through repeated lending at a 10 percent reserve ratio. Each bar shows the cumulative money created in the system.
Cumulative money supply grows far beyond the original €1,000 deposit.
Why it matters
Money creation by banks means that the supply of money is flexible. This fuels growth but can also cause bubbles. When lending is excessive, households and businesses carry too much debt. If many loans fail, banks pull back, shrinking credit and slowing the economy. This cycle explains why central banks monitor lending closely and set reserve requirements or capital rules.
Case: the 2008 crisis
Before 2008, banks in the U.S. expanded credit aggressively, especially mortgages. They created vast amounts of money by issuing loans that later defaulted. When defaults surged, the system froze. Central banks had to inject liquidity and guarantee deposits to stop collapse. The crisis showed both the power and the danger of bank-driven money creation.
Summary
- Banks create money when they lend - not just move existing deposits.
- Fractional reserve banking multiplies deposits through repeated lending.
- Tables and charts show how €1,000 can support several thousand in new deposits.
- Money creation drives growth but also carries systemic risk when credit is excessive.
Key Terms
Further Learning
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