Money & Finance › What money is & money theory
Fiat money: currency backed by law and trust, not metal
Global norm since 1971· Concept
Fact, law or dataA rule, statute, definition or measured number.
Fiat money has value because a government declares it legal tender and people trust it, not because it can be swapped for gold.
See it on the Money & Finance map →How it works
The dollar became fully fiat on August 15, 1971, when Nixon stopped exchanging dollars for gold with foreign governments. What holds its value now: taxes must be paid in dollars, courts enforce dollar debts, and the Fed is trusted to keep money growth in check. The upside is flexibility: central banks can expand money in a crisis. The downside is that nothing physical limits printing. The dollar has lost over 85% of its purchasing power since 1971.
Why it matters
Every major currency today is fiat. Its value depends on institutions, which is why Fed independence, deficits and inflation are watched so closely.
Facts, rules and data
Nixon's August 1971 televised address; floating exchange rates from 1973; BLS consumer price data, which show 1971 prices were about one-eighth of today's.
Debates and risks
Whether fiat systems are sound long term is debated by gold and bitcoin advocates, and by economists arguing over deficits and Fed independence.
Inside this (2)
Connections (8)
▸The gold standard was replaced by Fiat money: currency backed by law and trust, not metalFact, law or data
The connection
As economies and government spending grew, gold-backed promises became too tight to keep. The US ended domestic gold convertibility in 1933, and in 1971 Nixon closed the last window, for foreign governments. With no metal link left, the dollar and other currencies became pure fiat money.
When and why
Britain left gold in 1931, the US cut domestic gold ties in 1933, and the Bretton Woods link ended on August 15, 1971.
How we know
Official acts: Executive Order 6102, the Gold Reserve Act, Nixon's 1971 address and the 1976 Jamaica Accords, which formally ended gold's monetary role.
Debates and risks
Whether the switch was inevitable or a policy choice, and how much it contributed to the 1970s inflation, are debated.
▸Song dynasty paper money (jiaozi) was an early form of Fiat money: currency backed by law and trust, not metalFact, law or data
The connection
The jiaozi showed paper could circulate on the state's authority. Partly backed at first, Song and later Yuan notes rested more and more on government decree rather than redeemable metal, making them early forms of fiat money, about 950 years before the dollar's full switch.
When and why
Sichuan, China, from 1024; Yuan and early Ming paper money from the 1260s into the 1400s.
How we know
Song and Yuan official histories, surviving notes and printing plates, and Marco Polo's description of paper accepted across the Mongol empire.
Debates and risks
Whether jiaozi count as true fiat money or as backed notes depends on the period; historians date the shift differently.
▸Legal tender laws and Civil War greenbacks give legal force to Fiat money: currency backed by law and trust, not metalFact, law or data
The connection
Legal tender laws require creditors to accept a currency for debts, and the government takes it for taxes. The 1862 greenbacks proved this could make unbacked paper circulate. That legal force, plus taxes payable in dollars, is part of what gives today's fiat dollar value.
When and why
Washington, 1862, under Treasury Secretary Salmon Chase; upheld by the Supreme Court in 1871 and 1884.
How we know
The statutes and Supreme Court rulings; 31 U.S.C. § 5103 is the current law.
Debates and risks
How much legal status matters compared with trust and tax demand is debated; many fiat currencies have failed despite legal tender laws.
▸Fiat money: currency backed by law and trust, not metal is managed by The Federal Reserve System (the Fed)Fact, law or data
The connection
With no gold behind the dollar, nothing physical limits how much can be created. The Fed's job is to keep it scarce enough to hold value: it issues Federal Reserve notes, creates bank reserves electronically, and raises or lowers rates to control how fast money and credit grow.
When and why
Federal Reserve notes date from 1914; the system became fully fiat after the Nixon shock of August 1971 ended gold convertibility for foreign governments.
How we know
Every bill reads 'Federal Reserve Note', and the Fed's balance sheet lists currency in circulation, about $2.4 trillion in 2025, as a liability.
Debates and risks
Whether fiat money without metal discipline must lose value is debated; the dollar has lost roughly 85–90% of its purchasing power since 1971, but gradually rather than in a sudden collapse.
▸Nixon shock: the dollar leaves gold (1971) completed the global shift to Fiat money: currency backed by law and trust, not metalFact, law or data
The connection
Before 1971 the dollar was the last major currency with a gold link, and other currencies pegged to it. Once foreign governments could no longer swap dollars for gold, and pegs gave way to floating in 1973, no major currency had metal backing. Their value now rests on law, central banks and the economy behind them: fiat money.
When and why
Nixon's address of August 15, 1971; general floating from March 1973; the IMF's 1976 Jamaica agreement, effective 1978, formally ended gold's official role.
How we know
The amended IMF Articles abolished official gold prices, and no major central-bank law since has promised convertibility. The record is legal and uncontested.
Debates and risks
Gold advocates say fiat money enabled inflation and debt, as the dollar lost over 85% of its purchasing power since 1971; most economists credit it with letting central banks fight recessions.
▸Fiat money: currency backed by law and trust, not metal can collapse into Hyperinflation: when a currency collapsesMainstream view
The connection
Because nothing physical limits fiat money, a government that cannot tax or borrow can keep printing. If people lose faith, they spend the money as fast as possible and prices spiral. Every recorded hyperinflation has involved paper money, usually amid war or fiscal collapse.
When and why
Weimar Germany 1923, Hungary 1946 and Zimbabwe 2008, among 56 episodes catalogued by Hanke and Krus in 2012; Venezuela followed in 2016–19.
How solid is the link?
The Hanke–Krus data show recorded hyperinflations all involved paper money, typically financing large government deficits.
Debates and risks
Most fiat currencies never hyperinflate; why some governments lose control, and how well institutions protect the rest, is still argued.
▸Modern Monetary Theory (MMT) builds its case on Fiat money: currency backed by law and trust, not metalExperts disagree
The connection
MMT's key claims depend on fiat money. Because the dollar is not convertible into gold, and Washington borrows only in dollars, MMT argues the US can never run out of money, only into inflation. Under a gold standard, or for countries borrowing in a currency they do not issue, such as euro members, the argument fails.
When and why
Since Nixon ended dollar–gold convertibility in 1971; MMT writers from Warren Mosler (1993) onward build on Georg Knapp's 1905 'state theory' that money is a creature of law.
How solid is the link?
MMT texts make the link explicit; mainstream economists agree a fiat issuer need not default in its own currency, and dispute what follows from that.
Debates and risks
Whether the argument underrates inflation risk and bond-market limits, shown when UK gilt yields spiked in the 2022 budget crisis, is the core dispute.
▸Bitcoin was created as an alternative to Fiat money: currency backed by law and trust, not metalFact, law or data
The connection
Bitcoin was designed in 2008, amid bank bailouts, as money no government or central bank could print or control. Where fiat supply is set by central-bank decisions, bitcoin's is fixed by code at 21 million coins, and payments move between users without a bank. Its very first block carries a newspaper headline about a bank bailout.
When and why
Satoshi Nakamoto's white paper appeared October 31, 2008; the first block, January 3, 2009, quotes The Times: 'Chancellor on brink of second bailout for banks'.
How we know
The headline is readable in the first block's data; in 2009 Nakamoto wrote that 'the history of fiat currencies is full of breaches of that trust.'
Debates and risks
Economists argue a fixed supply is a flaw: prices would tend to fall over time and there would be no lender of last resort in a panic. Supporters see that as the point.