1716
When you deposited gold coins, you received banknotes as a receipt.
These banknotes were centered on the promise of exchange for a specified weight of coin. But they were printed in ever greater numbers to prop up share prices, until confidence collapsed. The assessment after the collapse did not reduce claims of 500 livres or less.
The Paper Printed Beyond Its Promise: A 3-Minute Guide
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1716
When you deposited gold coins, you received banknotes as a receipt.
2 years later
The bank gained the government's backing. You could now also pay taxes with the notes.
1717
John Law created a company to trade with Louisiana.
How it worked
He made it so you could buy company shares with government debt certificates.
1719
The share price skyrocketed.
500 → 5,350 livres
Face value → September price. The peak was around 10,000.
1720
To support the share price, more and more notes were printed.
May 21, 1720
The government ordered a reduction in the value of the notes and shares, and trust collapsed.
Afterward
People rushed to the bank, demanding gold coins.
5350livres
Share price in September 1719. The face value was 500 livres.
2235100000livres
Balance of banknotes at the end of May 1720.
It's May 1720. The government announces it will 'lower the value of the notes and shares each month.' You have these banknotes in your hand. What do you do?
Pick one
This was the same as the government itself admitting the paper's value would fall. Trust collapsed, and people holding the notes were left in a difficult position.
In reality, people swarmed the bank demanding gold coins, and some were even crushed in the crowd.
The later assessment did not reduce claims of 500 livres or less.

John Law, a native of Scotland, issued banknotes under the authority of the regent, the Duke of Orléans. He was a gambler well-versed in probability who, after killing a man in a duel in London and being sentenced to death, had fled to the continent. He argued that increasing the money supply would stimulate the economy.
In 1716, the Banque Générale was established. When gold coins were deposited, banknotes were issued as receipts. Two years later, this bank gained state backing and became the Banque Royale. The notes could also be used to pay taxes, and Law's personal credit became linked to the credit of the nation.
Law's scheme extended beyond the bank. In 1717, he founded the Company of the West, which aimed to monopolize the Louisiana territory along the Mississippi River. The heart of this system was the conversion of debt into equity, allowing company shares to be purchased with government bonds that were nearly worthless. It was a grand circuit: converting national debt into shares, which were then supported by banknotes.
The company absorbed the tobacco monopoly, the mint, and even tax collection, gaining control over both colonial trade and the nation's finances. However, the foundation of its wealth was not the colonies, but loans to the king and taxes. By the end of 1718, only twelve ships had set sail. The gap between this reality and the marshy lands of Louisiana only widened.
The buying and selling of shares took place on the Rue Quincampoix in Paris. In 1719, this narrow lane became the center of a frenzy. A share with a face value of 500 livres soared to 5,350 by September, eventually peaking at around 10,000 livres.
The word "millionaire", too, is French of the eighteenth century. Mackay's book of 1841 tells, as separate anecdotes, of a servant who went to sell shares for his master, pocketed the rise in price and left the country, and of Law's coachman, who earned enough to set up a carriage of his own and left his service. For neither does it give a source. This wealth was a wealth counted on paper.
What turned the promise around? Law tried to hold the company's share price at a high level, and more and more banknotes were printed to do it. By the end of May 1720, notes outstanding had reached 2,235,100,000 livres. The economic historian François Velde concludes that supporting the shares at so high a level led to uncontrolled money creation.
On May 21 of that year, the state issued a decree to devalue the notes and shares on a monthly basis. This was tantamount to the state itself admitting the depreciation of its paper, and confidence collapsed. People rushed to the banks demanding gold coins, and some were crushed in the crowds. At the beginning of December, Law fled the country, leaving his fortune behind in France.
However, later assessments reject a simple narrative. Claims of 500 livres or less were not reduced, accounting for half of the people and forty percent of the total amount.

Silver from the mines of Athens was at one time estimated at ten drachmas per citizen, at another time it became ships, and at yet another it adorned temples. The silver brought by the son of Persia moved the enemy's soldiers.

In 1668, a single coin born in Kameido, Edo, brought an end to the era of imported coins. This coin would survive famines and continue to be legal tender in Japan until the Shōwa era.

Yongle Tongbao coins were minted in Ming China, but hardly circulated within the country. There was a country that minted coins for export which it did not use itself, and a country that did not mint its own coins but used imported ones as its standard.
The rest of the story is in the material of NOMISMA.
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