money & economicsWikipedia1711–1720 · Britain

South Sea Company

the gist

The South Sea Company was a British joint-stock company founded in 1711 to consolidate and reduce the national debt. In 1713 it gained a monopoly on supplying enslaved Africans to Spanish South America, and it carried over 34,000 people across the Atlantic, yet it never earned significant profit from that trade. Its shares nonetheless rose as it took on more government debt, peaking in 1720 before collapsing back near their original price. The collapse ruined thousands of investors. Insiders had used advance knowledge of debt conversions, shares had been bought with loans secured on the same shares, and bribes had been paid to politicians. A parliamentary inquiry followed, and the Bubble Act of 1720 was passed.

how it works

The company's shares were pushed up by promises of huge future trade profits that never materialised. Insiders sold before the price fell, and buyers using share-backed loans were left exposed when prices dropped, so the fall spread through the whole market.

so what

The South Sea Bubble became the classic case of speculation driven by hype and insider dealing. It shaped British rules on joint-stock companies and remains a standard reference point for financial manias.

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