London, spring 1720. In a cramped lane off Cornhill called Exchange Alley, the coffeehouses are so full that deals spill into the street. Dukes send servants to buy. Poets buy. Country clergymen ride to town to buy. The object of all this desire is stock in the South Sea Company: blessed by Parliament, governed in name by the king himself, and rising so fast that contemporary price lists show it multiplying several times over in a matter of months.
Here is the detail that should stop you cold. The South Sea Company, at the center of the most respectable mania in history, conducted almost no trade. Tulip mania at least had tulips. This bubble was built on a company whose actual business, examined closely, barely existed. Almost nobody examined closely.
What people believed
The company had been founded in 1711 with an elegant-sounding swap: it took over a chunk of government debt, and in exchange the state paid it interest and granted it a monopoly on English trade with Spanish South America. The name conjured what the age wanted to imagine: silver from Peru, gold from the Americas, galleons heavy with profit.
The reality was thin to the point of translucence. Spain controlled that trade and had little intention of sharing it. The company's one substantial concession was the asiento, a treaty contract to ship enslaved Africans to the Spanish colonies, plus a single permitted merchant voyage a year. It was a business both grim and, by most accounts, unprofitable, and wars with Spain kept interrupting even that. Nine years in, the "South Sea" part of the South Sea Company was closer to a brand than an operation.
What the company actually did was finance. In 1720 its directors proposed their masterstroke: the company would take over most of the national debt. Holders of government bonds would be invited to swap them for South Sea shares. Parliament debated it, was courted for it (a later inquiry found that courtship included bribes in company stock to ministers and their circles), and approved it.
Look closely at the machine, because its shape is the whole story. The terms of the debt swap meant that the higher the share price stood, the fewer shares the company had to give each bondholder, leaving more shares for the company to sell for its own profit. A rising price was not a side effect of the scheme. A rising price was the scheme. The company's real product was its own stock.
How it inflated
If the product is the share price, everything the company does will be aimed at the share price, and in 1720 the directors wrote the playbook that promoters have been reusing ever since.
First, respectability as armor. This was no tavern trade in flowers. The scheme passed through Parliament. The king was the company's titular governor. Members of both Houses held stock. To doubt the South Sea Company was very nearly to doubt England, and social pressure did the work that evidence could not.
Second, easy terms. Shares were sold in subscriptions paid by instalments: put down a fraction now, pay the rest in scheduled steps. Suddenly anyone with a little cash could hold a lot of stock, and the early paper gains on that stock made everyone who bought feel like a genius, which is the most contagious feeling in finance.
Third, circular credit. The company lent money to investors against its own shares, so that money raised by selling stock was recycled into new demand for the stock. Read that sentence twice. The company was, in effect, buying its own product with its customers' money and booking the enthusiasm as proof of value.
It worked spectacularly, for a while. Contemporary price lists show the stock beginning the year around 128 pounds and standing near 1,000 by midsummer, a rise of roughly eightfold in about six months. And around the main event bloomed a garden of imitators, the "bubble companies," floated to catch the overflow of money: schemes for insuring every conceivable risk, for a wheel of perpetual motion, for extracting silver from lead. The most famous of all was the prospectus said to offer "an undertaking of great advantage, but nobody to know what it is," whose promoter allegedly collected a morning's subscriptions and vanished by afternoon. Honesty requires a flag here: that story may well be apocryphal. It appears in later accounts and Charles Mackay's Extraordinary Popular Delusions, over a century after the fact, made it immortal, but no one has produced the original prospectus. It survives because it is the bubble's perfect caricature: by the summer of 1720, the specific business had become an irrelevant detail of an investment.
Respectability is not a business. A company blessed by Parliament, named for an ocean, and bought by dukes can still be worth almost nothing if there is nothing underneath it, and no quantity of distinguished shareholders can conjure the missing cash flows.
The instalment machine, in modern money
Before the collapse, one piece of arithmetic, because instalment buying is not a quaint historical custom. It is leverage, meaning the use of borrowed or not-yet-paid money to control more of an asset than your cash could buy, and it explains both the mania's speed and its cruelty. Modern euros keep the numbers familiar; the mechanism is 1720's.
Suppose shares are sold on instalment: 20% down, the rest due later. You have €100, so you put it down and now control €500 of stock, owing €400.
| Scenario | Your €500 of stock becomes | You still owe | Your stake is worth | Your €100 became |
|---|---|---|---|---|
| Price doubles | €1,000 | €400 | €600 | 6 times more |
| Price unchanged | €500 | €400 | €100 | The same |
| Price falls 20% | €400 | €400 | €0 | Nothing |
On the way up, this machine multiplies gains sixfold and manufactures euphoria. On the way down, a 20% dip, an ordinary bad month for any stock, takes 100% of your money, and the remaining instalments still fall due. In 1720 thousands of people, from great lords to their footmen, were holding exactly this position, often financed by loans from the company itself. The market was a tower of promises to pay, and every promise assumed a higher price.
How it burst
The pin, fittingly, was the company's own weapon. In June 1720 Parliament passed the Bubble Act, requiring companies to hold a royal charter, a law promoted with South Sea support to kill the copycat companies competing for investors' cash. In late summer the company had proceedings brought against several rivals. It worked too well. Investors in those deflating bubbles had to sell something to cover their positions, and the something they sold was often South Sea stock. Selling met a market where every buyer was already stretched by instalments and loans, and the tower of promises began to fold in on itself.
Through the autumn the price collapsed, and contemporary price lists show it ending the year roughly back where it had begun, the entire eightfold rise unwound in a few months. Because so much of the market had been built on credit, the fall did not politely return everyone to their starting point. Fortunes assembled over generations went to pay instalment debts. Banks and goldsmiths who had lent against shares failed. The record of the aftermath is unusually good, because Parliament, in a fury of embarrassment, investigated its own bubble: the company's cashier fled abroad with the books, directors' estates were confiscated to compensate victims, and the Chancellor of the Exchequer was sent to the Tower. Edward Chancellor's Devil Take the Hindmost gives the fullest modern account, and notes how much of the machinery, the instalments, the loans against shares, the respectable names on the prospectus, would reappear in every mania after.
The lesson
The South Sea year kept one piece of evidence more valuable than all the price lists: a casualty report from the top of human intelligence. Isaac Newton, then master of the Royal Mint and the most celebrated mind in Europe, invested early, sold in the spring at a healthy profit, then watched the price keep rising without him. That feeling, watching fools get richer than you, broke him the way it breaks everyone. He bought back in near the top and was ruined out of a fortune, losing, by his niece's later account, some 20,000 pounds. He is said to have remarked that he could calculate the motions of the heavenly bodies, but not the madness of people. The quote is attributed rather than verified, another polished legend, but his losses are documented, and they prove the point the quote was invented to make: intelligence is no vaccine. Newton did not misunderstand the mathematics. He understood it perfectly and bought anyway, because the pull of a rising price on human judgment is not an intellectual force.
So the lesson has two clauses. Respectability is not a substitute for a business: before the pedigree of a scheme can matter, there must be something underneath it that earns money from real customers, and no parliament, monarch, or brilliant shareholder list can stand in for that. And your own brain is not a substitute for a rule: if Newton could not white-knuckle his way through a mania on raw intellect, you should not plan to.
Do this now
Take one investment you own, or one you are being tempted toward, and write a single sentence describing how the underlying business earns money, and from whom. Not why the price should rise: who pays, for what. If the sentence comes easily, keep it; it is the start of a thesis. If you find you are writing about who endorses it, who else is buying, or how respectable it all looks, you have your answer, and it is the South Sea answer.
Next in the series: Manias III: 1929, in which borrowed money turns a falling market into a machine that forces its own selling.