money multiplier

Example

“With a 10% reserve requirement, the money multiplier is 10 — each $1 in reserves can support $10 in deposits.”

Memory Tip

MONEY MULTIPLIER = 1 ÷ reserve ratio. 10% reserves = 10x multiplier on base money.

Why It Matters

Understanding the money multiplier helps you grasp how banks create money through lending and how this affects inflation, interest rates, and your savings account returns. It explains why central banks care about reserve requirements and why changes to banking regulations can impact the overall economy and your purchasing power.

Common Misconception

Many people think banks simply lend out the exact dollars customers deposit, but the money multiplier shows that banks can create far more money through a chain of lending. This does not mean money appears from nowhere; rather, each deposit gets loaned out and redeposited multiple times, expanding the money supply throughout the banking system.

In Practice

If the reserve requirement is 10 percent, the money multiplier equals 1 divided by 0.10, which is 10. This means a single $1,000 deposit can theoretically support up to $10,000 in total money creation as banks lend out 90 percent of deposits repeatedly. For example, you deposit $1,000, the bank lends $900 to a borrower, who deposits it elsewhere, creating another $810 in available lending power in the system.

Etymology

MONEY (currency) MULTIPLIER (factor that amplifies). The factor by which MONEY is MULTIPLIED through banking.

Common Misspellings

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