Fiat Currency

The modern fiat era has a precise starting point: on August 15, 1971, the United States ended the dollar's convertibility into gold, and within a few years every major economy followed suit, moving to floating exchange rates untethered from any physical commodity. Since then, the value of a euro, dollar, or yen has rested entirely on legal tender status, the taxing and spending power of the issuing government, and the collective willingness of businesses and savers to keep using it.

In practice, central banks manage the supply of fiat money through interest rates and reserve requirements, while commercial banks expand it further through lending, a process known as fractional reserve banking. This flexibility lets policymakers respond to recessions or price shocks, but it also means the money supply can grow faster than the goods and services behind it, a classic driver of inflation. History offers stark warnings: Weimar Germany in the 1920s and Zimbabwe in the late 2000s both saw their currencies collapse into hyperinflation once public trust broke down.

Cryptocurrency emerged partly as a response to this vulnerability, offering assets with a fixed or algorithmically predictable supply outside any government's control. A stablecoin takes the opposite approach, pegging its value to a fiat currency to combine price stability with blockchain settlement, while a Central Bank Digital Currency digitizes fiat itself, issued directly by a central bank rather than by commercial banks or private networks. Today, most fiat money is already digital, existing as bank ledger entries rather than physical notes, which is one reason the line between traditional finance and crypto continues to blur.