
The Bubble of 1720: The Mississippi Bubble and the South Sea Bubble
The year 1720 is infamous in financial history for two major speculative bubbles that burst within months of each other: the Mississippi Bubble in France and the South Sea Bubble in England. Both events were driven by speculative investments, financial innovation, and excessive greed, leaving behind lessons on the dangers of unchecked financial speculation.
The Mississippi Bubble
The Mississippi Bubble was the brainchild of John Law, a Scottish financier who established the Mississippi Company (later part of the Company of the Indies) in France. Law envisioned a grand scheme to stabilize France’s struggling economy by linking it to the wealth of its colonial territories, particularly in the Mississippi region of North America.

Law persuaded the French government to allow the Mississippi Company to take over national debt in exchange for shares. He promised that the untapped resources of the Louisiana Territory, including gold and other riches, would generate vast profits. Excited by the prospect of immense wealth, investors rushed to purchase shares, driving up their value astronomically.
By late 1719, the frenzy reached its peak as the price of Mississippi Company shares soared more than twenty fold. However, the bubble burst in 1720 when doubts emerged about the company’s ability to generate actual profits. Investors began to sell their shares en masse, leading to a collapse in prices. The French economy suffered severe repercussions, and Law fled the country in disgrace.
The South Sea Bubbleubble
The South Sea Bubble occurred in England around the same time. The South Sea Company, established in 1711, was granted a monopoly on trade with Spanish colonies in South America in exchange for assuming part of the British government’s debt. The company promoted itself as a lucrative investment opportunity, despite its minimal actual trade activity.

In early 1720, the British government allowed the South Sea Company to convert public debt into company shares. This created immense hype, leading to a speculative frenzy. The price of South Sea shares skyrocketed from £100 to over £1,000 within months as investors poured their savings into the company, hoping for extraordinary returns.
However, like the Mississippi Bubble, the South Sea Company’s promises of profitability proved illusory. When investors started questioning the company’s true value, panic selling ensued, causing the share price to plummet. Many investors, including members of the aristocracy and Parliament, were ruined. The scandal led to widespread outrage, government investigations, and reforms in financial regulation.
The Aftermath
Both bubbles exposed the risks of speculative mania and unregulated financial practices. The Mississippi Bubble destabilized France’s economy, contributing to long-term mistrust of financial markets and innovation. In England, the South Sea Bubble led to political fallout and greater oversight of the financial system. Laws were enacted to curb speculative schemes, including the Bubble Act of 1720, which aimed to regulate joint-stock companies.
Lessons from the Bubbles
The bubbles of 1720 serve as cautionary tales about the dangers of speculative excess, overconfidence in untested financial models, and the herd mentality of investors. They also highlight the critical need for transparency, regulation, and due diligence in financial markets. Despite occurring more than three centuries ago, these events remain relevant as modern financial markets continue to grapple with similar speculative booms and busts.
The Mississippi and South Sea bubbles remind us that when greed overtakes rationality, the consequences can ripple across economies, leaving devastation in their wake.
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