In September of 1715, Louis XIV died, and his nephew the Duke of Orleans was left in charge of the country, as regent to the child king Louis XV. The Duke was quite something. “He was born bored,” the great diarist Saint-Simon, a friend of the Duke’s since childhood, observed. “He could not live except in a sort of torrent of business, at the head of an army, or in managing its supply, or in the blare and sparkle of a debauch.” Facing the financial crisis of the French state, the Duke started listening to the ideas of John Law. Those ideas—more or less orthodox policy today—were wildly original by the standards of the eighteenth century.
Law thought that the important thing about money wasn’t its inherent value; he didn’t believe it had any. “Money is not the value for which goods are exchanged, but the value by which they are exchanged,” he wrote. That is, money is the means by which you swap one set of stuff for another set of stuff. The crucial thing, Law thought, was to get money moving around the economy and to use it to stimulate trade and business. As Buchan writes, “Money must be turned to the service of trade, and lie at the discretion of the prince or parliament to vary according to the needs of trade. Such an idea, orthodox and even tedious for the past fifty years, was thought in the seventeenth century to be diabolical.”
This idea of Law’s led him to the idea of a new national French bank that took in gold and silver from the public and lent it back out in the form of paper money. The bank also took deposits in the form of government debt, cleverly allowing people to claim the full value of debts that were trading at heavy discounts: if you had a piece of paper saying the king owed you a thousand livres, you could get only, say, four hundred livres in the open market for it, but Law’s bank would credit you with the full thousand livres in paper money. This meant that the bank’s paper assets far outstripped the actual gold it had in store, making it a precursor of the “fractional-reserve banking” that’s normal today. Law’s bank had, by one estimate, about four times as much paper money in circulation as its gold and silver reserves. That is conservative by modern banking standards. A U.S. bank with assets under a hundred and twenty-four million dollars is obliged to keep a cash reserve of only three per cent.