The Mississippi Bubble — paper money that bankrupted a kingdom’s faith in banks

In Paris between 1719 and 1720, the shares of John Law’s Mississippi Company rose from around 500 livres to a peak near 10,000 — a twentyfold climb in roughly a year — before collapsing back toward their starting value and dragging France’s experiment in paper money down with them. The Mississippi Bubble was the first great fiat-currency catastrophe: a scheme that fused a trading monopoly to a national bank, printed money to buy its own shares, and ended in hyperinflation, bankruptcy, and a national distrust of banks and paper that lasted generations.

Its architect was John Law, a Scottish economist, gambler, and convicted duellist who had fled Britain and won the ear of the Duke of Orléans, regent of France during the minority of Louis XV. France was crushed by debt left from the wars of Louis XIV, and Law offered a radical cure: replace scarce gold and silver with paper money issued by a bank, and use a great trading company to soak up the public debt. In 1716 he founded the Banque Générale, which became the state-backed Banque Royale; his Compagnie d’Occident, soon enlarged into the Compagnie des Indes, monopolised French colonial trade, including the vast Mississippi territory of North America.

What followed was the “System” — a self-reinforcing machine in which the bank printed notes, the public used them to buy company shares, and rising shares justified printing more notes. Speculation in the narrow Rue Quincampoix grew so frenzied that the word “millionaire” was reportedly coined there to describe the newly rich. But the wealth of the Mississippi territory was a fantasy of swamp and disease, the share price rested on nothing but expectation, and the flood of paper money far outran the gold that supposedly backed it. When investors began converting shares and notes back into coin, the System could not honour them.

The collapse through 1720 was ruinous. Attempts to prop up the price, restrict gold withdrawals, and halve the value of banknotes by decree only destroyed confidence; crowds besieged the bank, and people were reportedly crushed to death in the press to convert paper into coin. Prices spiralled into hyperinflation, fortunes evaporated, and Law fled France in December 1720, dying in poverty in Venice in 1729. France emerged so scarred that it shunned a true central bank and the word “banque” itself for decades — a delusion whose hangover outlasted the boom by a lifetime.