Fiat Money
What is Fiat Money?
Fiat money is currency that has value because a government declares it legal tender, not because it's backed by a commodity like gold.
Modern currencies like the U.S. dollar are fiat money; their value rests on trust and the government's stability. It gives central banks flexibility over the money supply but requires discipline to avoid inflation.
Fiat Money: a worked example
Nordia's central bank prints a 50 krona note for 8 ore of paper and ink, which is 0.08 krona. Issuing 200,000 of those notes injects 200,000 times 50, or 10,000,000 krona of new money, at a printing cost of 200,000 times 0.08, or 16,000 krona. The difference, 9,984,000 krona, is seigniorage: real resources the state commands simply by declaring the paper to be money. That power is also the hazard. If the money stock was 40,000,000 krona beforehand, the new notes raise it by 25%. With velocity and real output unchanged, the equation of exchange MV = PY sends the price level up by the same 25%, so a jacket that cost 20 krona now costs 25. Nothing about the paper changed, only how much of it exists.
The mistake students make with fiat money
Students often write that fiat money is backed by the government's gold reserves, or that a note can be redeemed at a bank for something tangible. The phrase full faith and credit invites the guess, and the gold standard usually gets taught in the same unit. No redemption window exists, and the practical consequence shows up on macro questions. A central bank's holdings of metal place no ceiling on how many notes it can issue, so the money supply is a policy choice, which is exactly why the exam draws it as a vertical line set by the central bank.
Fiat Money questions
Why does fiat money have value if nothing backs it?
Fiat money holds value because everyone expects everyone else to accept it, and three forces sustain that expectation. Taxes must be paid in the national currency, legal tender laws require creditors to accept it in settlement of debts, and the central bank keeps its quantity limited relative to output. Remove that last condition and the first two will not save the currency, which is why an overissued fiat money loses value even while remaining legal tender.
Is money in a checking account fiat money?
Checking deposits are not currency, though they function as money and are counted in M1 alongside cash. A deposit is the bank's promise to pay you fiat currency on demand, so its value rests on the same fiat unit plus the bank's solvency and deposit insurance. On the AP exam, treat physical notes and coins as the fiat money itself, and treat deposits as bank created money resting on top of that base.
Can a fiat currency collapse?
Fiat currencies collapse when the issuing government creates money faster than the public is willing to hold it and confidence breaks. Once households expect the unit to lose value, they spend it on arrival or switch to a foreign currency, which drives velocity and prices up together. The government then needs to issue even more notes to command the same real resources, and each round of issuance shortens the time anyone is willing to hold the currency.
Related terms
Common comparisons
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