Tulip Mania and the South Sea Bubble: Myths and Facts
Separate the legend of tulip mania from the evidence, and see how the South Sea Company's debt-for-shares scheme turned a rising share price into a self-reinforcing machine.
What you will learn
- What actually happened in the Dutch tulip trade of 1636–37 and which popular claims are exaggerated.
- How unmargined forward contracts and their cancellation shifted losses between buyers and sellers.
- How the South Sea Company's 1720 debt conversion created an incentive to push its own share price higher.
- How partly paid shares and loans on shares multiplied investors' losses.
Explanation
Tulip mania: the legend
The famous version is from Charles Mackay's 1841 book Extraordinary Popular Delusions and the Madness of Crowds. He claimed that almost all of Dutch society joined the trade, that one bulb was offered for about 12 acres of land, and that many people were ruined. His sources drew on satirical pamphlets.
Tulip mania: the evidence
Prices of rare bulbs rose from 1634, peaked in winter 1636–37 and collapsed in early February 1637. The historian Anne Goldgar (Tulipmania, 2007) found in archive records that traders were mostly merchants and skilled craftsmen, and identified fewer than half a dozen notable people in financial trouble, without clear proof that tulips caused it.
The key is the contract type. In winter the bulbs were in the ground, so people traded forward contracts: agreements, often signed before a notary, to buy a bulb at a fixed price on delivery months later. The Dutch called this windhandel ("trade in wind"). There was no margin (a security deposit) and no exchange between the parties, so each buyer depended on one seller. That is counterparty risk: the risk that the other side does not pay.
After the collapse, buyers refused to pay. In May 1637 the city of Haarlem allowed buyers to cancel contracts by paying 3.5% of the agreed price. Most contracts were never fulfilled. Losses fell on those who traded on credit, and rules made after the event decided who carried them.
The South Sea Bubble of 1720
The South Sea Company was founded in 1711 to take over part of Britain's government debt. Its trade, including the slave trade, was largely unprofitable. In 1720 Parliament approved a plan under which holders of government debt could exchange it for South Sea shares. The company set the exchange rate using the market price of its shares, so the higher its share price, the fewer shares it had to give each debt holder, and the more new shares were left over to sell for cash.
The share price rose from about £128 in January 1720 to about £1,000 in early August, then fell to about £150 by the end of September and about £100 by the end of the year. It sold new shares payable in instalments and lent buyers money against their shares. The Bubble Act of June 1720 required new joint-stock companies to have a royal charter or an act of Parliament; it remained in force until 1825. An inquiry in 1721 found fraud by directors and corruption among ministers. Isaac Newton is often said to have lost a large sum, but the amount is disputed, and the famous quote about "the madness of men" has no reliable original source.
Worked example
Hypothetical, simplified example of the conversion incentive: for every £1,000 of government debt converted, the company may create new shares with a nominal value of £1,000 (10 shares of £100 nominal). The debt holder receives shares worth £1,000 at the current market price. The company can sell the remaining shares for cash. Costs and interest are excluded.
| Market price per share | Shares to debt holder (£1,000 ÷ price) | Shares left over (10 − given) | Cash from selling leftovers |
|---|---|---|---|
| £200 | 5 | 5 | 5 × £200 = £1,000 |
| £400 | 2.5 | 7.5 | 7.5 × £400 = £3,000 |
| £800 | 1.25 | 8.75 | 8.75 × £800 = £7,000 |
Each doubling of the share price more than doubled the cash raised, and part of it could be lent back to buyers. This is a feedback loop: the price rise financed the next rise, until new buyers ran out.
Common mistake
Practice activity
On paper, two hypothetical cases. (a) In December 1636 a buyer signs a forward contract to buy a bulb for 1,000 guilders on delivery in June. By late February similar bulbs sell for 100 guilders. What is the buyer's loss if the contract is enforced, and what does he pay under a 3.5% cancellation rule? Who carries the rest? (b) In 1720 an investor subscribes for one share at £1,000, paying 10% now and the rest in later instalments. The price falls to £200. Ignoring interest, what is the investor's net position, and how large is it compared with the cash paid?
Show solution
(a) Enforced: 1,000 − 100 = 900 guilders loss. Under the 3.5% rule he pays 0.035 × 1,000 = 35 guilders. The seller keeps a bulb now worth 100 instead of receiving 1,000, so the seller carries the remaining loss.
(b) Cash paid: £100. Still owed: £900. Share worth £200. Net position = £200 − £900 = −£700 on top of the £100 already paid, a total loss of £800, which is 8 times the cash put in.
Limitations: real 1720 subscription terms varied.
Key takeaways
- Tulip mania was real as a price collapse, but the stories of mass ruin are not supported by archive evidence.
- Unmargined forward contracts create counterparty risk; after a crash, rules and courts decide who loses.
- The South Sea scheme linked the company's cash to its own share price, which created a self-reinforcing loop.
- Paying in instalments or with borrowed money can make losses several times larger than the cash invested.
Next step
In the next lesson you see how borrowed money, bank failures and policy mistakes turned the 1929 crash into the Great Depression.
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