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Paper money is an invention, not a natural law. Here's how it spread from medieval China to the modern world.

A Chinese invention, often forgotten

Paper money was invented in China during the Tang dynasty (around the 9th century) and matured under the Song dynasty. Merchants traveling long routes hated lugging strings of copper coins, so private banks issued paper certificates redeemable at distant locations. The state quickly took over the system, and by the 11th century, government-issued paper money — jiaozi — was circulating widely.

It worked beautifully… until the government printed too much. By the 14th century, runaway issuance had wrecked the system, and China actually returned to silver coins for centuries.

Marco Polo's amazement

When Marco Polo described Chinese paper money to Europeans in the 13th century, they thought he was making it up. The idea that small, signed pieces of paper could buy real goods seemed magical. It would take Europe another 400 years to adopt the practice.

Europe finally catches up

The first European paper money appeared in Sweden in 1661, issued by the Stockholms Banco. The bank promptly over-issued and collapsed within years — an early lesson Europeans would relearn many times.

The Bank of England, founded in 1694, was a more durable model. Its notes — issued against deposits of gold and silver — became one of the most trusted financial instruments in history. The bank still issues banknotes today, more than 330 years later.

The American experiments

Colonial America was chronically short of British coins, so colonies issued their own paper money — bills of credit. They worked, with mixed discipline, until the Revolutionary War, when the Continental Congress issued so much paper currency ("Continentals") that "not worth a Continental" became an American idiom.

The trauma shaped the U.S. constitution: only the federal government can coin money, and for most of the 19th century, paper money was issued only against gold or silver reserves.

Greenbacks and the Civil War

The U.S. Civil War forced another paper experiment. Lincoln's government issued United States Notes — "greenbacks" — with no metal backing. They depreciated, but they worked well enough to fund the war. After the war, the country slowly returned to gold convertibility, completing the transition by 1879.

The 20th century: from receipts to fiat

For the first half of the 20th century, paper money in most countries was a receipt for gold or silver. You could walk into a bank and demand metal in exchange.

Two world wars and the Great Depression broke that link in stages:

What gives paper money its value today?

Three things:

  1. Government decree — taxes must be paid in the official currency, creating baseline demand.
  2. Network effects — everyone accepts it because everyone accepts it.
  3. Central-bank credibility — confidence that the supply won't be reckless.

That third pillar is the most fragile, and the most important. When it cracks (Weimar, Zimbabwe, Venezuela), the paper itself becomes worthless almost overnight.

Paper in the digital age

Paper money is slowly fading. In Sweden, less than 10% of transactions involve cash. In China, urban life is essentially cashless. The U.S., paradoxically, still has more physical dollars in circulation than ever — most of them held abroad.

But the form matters less than the trust. Whether money is paper, plastic, or pixels, the question that decides its value is unchanged: do people believe it?

Key takeaways

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