South Sea Bubble 1720
The South Sea Bubble was a 1720 London equity-and-debt-conversion mania around the South Sea Company that imploded the same year, taking a layer of insider finance and political reputations with it.
Definition
The company took in government debt in exchange for shares, then issued more equity into a rising price, using the premium as ‘capital.’ Politics, bribery, and a shortage of float turned the stock into a lottery. The collapse left a web of unpaid calls and a political purge (the Bubble Act context).
Why it matters
It is the ancestor of sovereign-debt-for-equity schemes and of ‘financial engineering as fiscal policy.’ When the state’s balance sheet is the story, the stock is a political object.
Case
Share prices rose roughly 8× in 1720 and collapsed back. Newton’s alleged remark about not calculating the madness is folklore; the parliamentary inquiry is the primary source.
How to read it
Map who was converting debt, who was issuing, and who could not sell. A closed float plus official sponsorship is the danger pattern — it returned in later privatization manias.
Key papers
Landmark references with real publisher or arXiv links — not token-overlap noise.
- Famous First BubblesGarber · 1990 · Journal of Economic PerspectivesSouth Sea and Mississippi in one frame.