The Wizard of the Mississippi: John Law’s Bubble 1720 | Market Mayhem EP02

It is January 1720. A narrow street in the heart of Paris called the Rue Quincampoix. It is barely wide enough for a carriage, but right now there are ten thousand people crammed into it. Shoulder to shoulder. Screaming prices. Waving paper in the air.

Duchesses stand next to their own servants. Priests elbow past merchants. A hunchbacked man is making a small fortune by renting out his back as a writing desk so traders can scribble contracts on it. Every single person is buying shares in one company. The Mississippi Company. A company that promises the swamps of Louisiana are overflowing with gold.

The man who created this company is John Law. A Scotsman. A mathematical genius. A professional gambler. And a convicted murderer who killed a man in a duel and escaped from prison. Right now, he controls the French national bank, all overseas trade, the tax system, and the national mint.

In five months, all of it will be ashes. Shares will fall 98%. Fifteen people will die in a bank run. And France will refuse to trust paper money for eighty years.

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The Crisis at a Glance

Data Point	Detail
Event	The Mississippi Bubble — history’s first central-banking-fuelled speculative mania
Key Figure	John Law (1671–1729) — Scottish mathematician, gambler, duellist, convicted murderer, monetary theorist
France’s Debt at the Time	3 billion livres debt. Annual revenue: 145 million livres. Debt-to-revenue ratio: 20:1
Share Price Journey	500 livres (Jan 1719) → 12,500 livres peak (Jan 1720) → 200 livres (Dec 1720)
Total Rise	25x in 12 months
Total Collapse	98% — from 12,500 to 200 livres
Money Supply Explosion	Banknotes in circulation tripled in under a year — from near zero to 2.6+ billion livres
Word Invented Here	“Millionnaire” — coined in Paris during this bubble. The French language had never needed it before.
Bank Run Deaths	15 people crushed to death outside the Banque Royale — July 17, 1720
Law’s Fate	Fled Paris in disguise. Wandered Europe gambling to survive. Died in Venice, 1729. Penniless.
Long-term Trauma	France refused paper currency for 80 years — until Napoleon’s Banque de France (1800)
M·M·M Lesson	Money — printing money creates illusion of wealth, not wealth itself. Mind — when cab drivers give stock tips, you’re inside a bubble. Method — stories are not valuations.

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A Gambler, a Killer, and a Bankrupt Kingdom

John Law was born in Edinburgh in 1671, the son of a wealthy goldsmith. Brilliant with numbers. By his teenage years he could calculate odds and probabilities faster than most men could with pen and paper. He moved to London at twenty-one, became a fixture of the gambling houses and coffee shops of the West End. Tall, charming, reckless with money, and irresistible to women.

In 1694, he killed a man named Edward Wilson in a duel over a woman. He was arrested, tried, sentenced to death. He escaped from prison — likely with help from powerful friends — and fled to the Continent. For the next twenty years he wandered Europe, gambling for a living and developing an extraordinary theory about money.

Law’s big idea: money doesn’t need to be gold. Money is simply a tool of exchange, and the more of it that circulates in an economy, the more trade happens, the more wealth is created. Paper money, backed by the confidence of the state, could replace gold entirely and supercharge an economy. He was two centuries ahead of his time. He was also a gambler who could never stop doubling down.

France in 1715 was the most powerful nation in Europe and functionally bankrupt. Three billion livres in debt. Annual revenue of just one hundred and forty-five million. The Regent, Philippe, Duke of Orléans, was desperate. Law presented his plan. Philippe, out of options, said yes.

The Frenzy: Millionaires Made on a Street Corner

In August 1717, Law created the Mississippi Company — a monopoly on all trade with France’s Louisiana Territory. He told investors Louisiana was rich beyond imagination. Gold. Silver. Precious stones. Louisiana was a mosquito-infested swamp. The few colonists who had gone there were starving. There was no gold. But nobody in Paris knew that.

By 1720, Law personally controlled the money supply, all overseas trade, the national mint, and the tax collection system. One man running the entire French economy. The share price: 500 livres in January 1719, climbing to 12,500 by January 1720. A twenty-five-fold increase in twelve months.

The Rue Quincampoix became an open-air stock exchange. Ten thousand people crammed in daily. A waiter reportedly made thirty million livres. A chimney sweep retired as a gentleman. The word “millionnaire” was coined here — in these streets, in this mania. The French language had never needed it before.

The Crash: When the Paper Turned to Ash

The smart money started moving early. Richard Cantillon bought Mississippi shares early, made a fortune, then sold everything. Converted his profits into gold. Quietly moved his wealth out of France. Almost everyone who made money in the bubble would lose it again. Cantillon kept every livre.

On May 21st, 1720, Law issued a decree: shares would be reduced in value by fifty percent. The reaction was immediate. Trust, once shattered, does not reassemble on command. Bank runs began. On July 17th, fifteen people were crushed to death outside the Banque Royale. Shares collapsed from 12,500 to 200 livres by December. A ninety-eight percent fall.

John Law fled Paris in December 1720 — reportedly in disguise. His mansion, his art collection, his estates — all seized. He spent his last nine years wandering Europe, gambling to survive. He died in Venice in 1729. Penniless. Forgotten.

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What This Means for You as a Trader

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Frequently Asked Questions

Who was John Law and why was he in France?

John Law was a Scottish mathematician and gambler who had spent twenty years developing theories about monetary economics after fleeing Britain following a fatal duel in 1694. He arrived in France in 1714 and proposed a paper money system that would solve France’s catastrophic debt problem. Philippe, facing a debt-to-revenue ratio of twenty to one, was desperate enough to try it. Law’s system initially worked — trade improved and credit flowed — before the speculative mania took everything beyond any rational control.

What was the Mississippi Company and what did it actually own?

The Mississippi Company held a monopoly on all French trade with the Louisiana Territory — roughly a third of what is now the continental United States. Law promoted enormous gold and silver deposits in Louisiana. In reality, Louisiana was largely unexplored swampland with no precious metals. French colonists sent there were dying of disease. The company’s actual revenues were negligible. Its entire valuation was built on a story of future wealth, not current economic reality.

How did Law’s money printing actually work?

Law’s Banque Royale issued paper banknotes accepted for tax payments — giving them instant credibility. As demand for Mississippi shares grew, the bank printed more notes to fund purchases. More notes increased demand for shares, which drove prices higher, which required more notes. The money supply roughly tripled in under a year. This is the feedback loop of monetary inflation attached to an asset bubble — the reason prices of bread and meat began rising sharply even as nominal share prices soared.

What caused the crash?

The structural cause was that the system was built on promises — paper backed by a company with no real assets and a currency backed by nothing but confidence. The trigger was Law’s own desperate May 1720 decree announcing a fifty percent reduction in share and note values. It was reversed within six days — but trust, once destroyed, cannot be legislated back. Once investors understood the government was admitting the paper was worth less than stated, the rush to convert paper back to gold became unstoppable.

Was John Law’s monetary theory actually correct?

In its fundamentals, yes. Law’s core insight — that paper money could be more efficient than gold, that money supply management is a legitimate policy tool — underpins every modern central banking system. Every economy today runs on fiat currency. In this sense, Law was two centuries ahead of his time. The problem was not the theory. It was the execution: no independent checks, a gambler who could not stop printing, a company whose asset was a story, deployed in a country too desperate to ask questions.

What is the most important lesson from the Mississippi Bubble?

The Mississippi Bubble is the original template for every monetary stimulus-fuelled asset bubble that followed. The pattern: genuine crisis → radical monetary intervention → initial success → speculative capital detaches prices from value → more printing to sustain prices → currency destruction → total collapse. The human cost is always borne by the people who trusted the system most completely. Recognising this pattern — in 2008, in 2020, in any environment of extraordinary monetary accommodation attached to rapidly rising asset prices — is the practical lesson Law’s disaster offers across three centuries.

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Market Mayhem is a historical education series produced by The Complete Trader’s Edge. All figures are sourced from historical records. Content is for educational purposes only and does not constitute financial or investment advice. Trading involves significant risk of loss.