Money is something people generally accept to pay for goods and services. It also gives prices a shared unit and lets people hold purchasing power for later. Today, money is not just coins and notes: much of what people use is a balance recorded in a bank account. Economists commonly explain money through these three functions, though that framework is not a universal legal definition.
What makes something money?
Money works because people accept it in payment and can use it to express prices and carry value forward. Its form has changed: the Bank of England describes money used today as cash and bank deposits, after earlier forms that included gold and silver. What counts in a country’s official money-supply statistics depends on the measure that country’s authorities define; the term does not automatically include every asset that can be sold or transferred.
Money is related to, but not identical with, wealth, credit, or payment technology. Wealth includes assets that may not be accepted directly at a shop. Credit is an arrangement to borrow or pay later. A payment app may help move money without itself being the money. Whether an instrument belongs in a formal money-supply measure depends on the jurisdiction and the measure.
What are money’s three main functions?
Medium of exchange
Money lets a buyer pay a seller without needing to offer a good that the seller happens to want in return. The Bank of England describes this as a reliable means of exchange between buyer and seller. Its usefulness depends on acceptance: something that few people will take in payment is less effective as money.
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Unit of account
Money provides a shared unit for stating and comparing prices. In the UK, for example, prices are expressed in pounds and pence; the euro area uses euros. The European Central Bank (ECB) puts the function this way: “Money allows goods and services to be priced, and prices to be compared.”
Store of value
People can hold money now and spend it later, so it can carry purchasing power through time. That does not mean it preserves purchasing power perfectly. If prices rise, the same nominal balance buys less. A balance of £20 remains £20 in nominal terms even if the goods it can buy become more expensive.
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What forms does money take today?
Cash
Notes and coins are physical money. They can be handed over directly and do not require a bank-account balance at the moment of payment, although acceptance and practical access vary by transaction and location.
Commercial-bank deposits
A checking or current-account balance is electronic money recorded as a liability of a commercial bank. Customers commonly use these balances to pay by card, transfer, or other account-based methods. The ECB says commercial-bank money makes up most of the money people use in the euro area.
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Central-bank money
Central-bank money includes notes issued by a central bank and reserve balances that commercial banks hold there. Bank reserves are used within the banking system; they are not the same as a household’s checking-account balance.
The Bank of England’s explainer, updated 27 February 2025, says 96% of money in the UK is held electronically and 4% physically as cash. Those figures describe the UK and the Bank’s stated date, not the global mix or every country’s monetary statistics.
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What is the difference between commodity and fiat money?
Commodity money has value connected to the material from which it is made. Gold and silver are familiar examples, and the Bank of England notes that people have also used items such as feathers and cowrie shells as money. Fiat money is not convertible into a fixed quantity of gold or another commodity. Its acceptance instead rests on public confidence, established institutions, and its usefulness in everyday exchange; saying it is simply “backed by nothing” misses those foundations.
The Bank of England offers one historical example rather than a complete global chronology: goldsmith receipts were an early precursor to banknotes, and the link to the gold standard for Bank of England notes ended in 1931. Thereafter, those notes were fiat money.
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How is money created, and what do central banks do?
In the euro-area explanation from the ECB, commercial banks create commercial-bank money when they expand their balance sheets—for example, when a bank makes a loan and credits a borrower’s account. When the loan is repaid, money created in that way is removed. This describes commercial-bank deposits; it does not mean each loan creates central-bank reserves or cash.
Central banks issue central-bank money, including notes and banks’ reserve balances, and have roles in monetary policy and the monetary system. Commercial-bank deposits and central-bank money are distinct forms, even though they are connected through the banking system. The ECB’s account is a jurisdiction-specific explanation, not a complete accounting model for every country or every kind of financial institution.
What does “money supply” mean?
Money supply is a measured category, not a synonym for all wealth or all financial assets. Authorities define aggregates to answer particular monetary questions, and their scope differs across jurisdictions.
- United States: The Federal Reserve distinguishes the monetary base, M1, and M2. Its M2 measure includes M1 plus small-denomination time deposits and retail money-market mutual-fund shares.
- Euro area: The ECB describes aggregates ranging from narrower M1 to broader M3. These are euro-area statistical categories, not interchangeable with U.S. measures.
So a statement about “the money supply” is clearest when it names the country or region and the aggregate being discussed.
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The Federal Reserve Education lists divisibility, portability, acceptability, scarcity, durability, and stability as useful characteristics. They are practical guides, not a universal legal checklist. Together they help explain why people need something that can be split into useful amounts, carried or transferred, accepted by others, and trusted to retain enough usefulness to serve as a payment and pricing standard.
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