Table of Contents

Bubble Act

The 30-Second Summary

What is the Bubble Act? A Plain English Definition

Imagine a city-wide party that has gotten completely out of control. What started as a fun gathering has descended into chaos, with people making wild, reckless decisions. The Bubble Act was the equivalent of the authorities showing up, shutting the whole thing down, and declaring that from now on, anyone who wants to host a party needs a special, hard-to-get permit. The “party” was the London stock market in 1720. The “host” was a company called the South Sea Company, which had promised investors unbelievable riches. Its stock price was soaring to absurd heights, and the public went into a speculative frenzy. Seeing this mania, opportunistic promoters began creating their own “bubble companies” for the most ludicrous purposes imaginable—from importing giant donkeys from Spain to, famously, “a company for carrying on an undertaking of great advantage, but nobody to know what it is.” People threw their money at anything that called itself a company. The Bubble Act of 1720 was Parliament's panicked reaction. It essentially banned the creation of new joint-stock companies—the ancestor of the modern corporation—unless they had a Royal Charter. This was a crude but powerful tool designed to stop the flood of sham companies that were draining investors' savings. It was less like a surgeon's scalpel and more like a sledgehammer, intended to smash the speculative mania before it brought down the entire British economy. The Act is a stark reminder of what happens when stock prices become completely detached from reality. It's a story about human psychology, greed, and the government's often-clumsy attempts to regulate them. Even one of the greatest minds in history, Sir Isaac Newton, was famously caught up in the South Sea Bubble, losing a fortune. His experience led to a quote that should be etched on the desk of every value investor:

“I can calculate the motion of heavenly bodies, but not the madness of people.”

Why It Matters to a Value Investor

The Bubble Act is more than a historical curiosity; it's a foundational text for the value investing philosophy. While the law itself was repealed in 1825, the principles it grapples with are as relevant today as they were in 1720. For a value investor, its history is a masterclass in what not to do.

How to Apply Its Lessons in Practice

You can't use the Bubble Act itself, but you can arm yourself with its hard-won wisdom. A value investor can apply these lessons by adopting a “Post-Bubble Act” mindset when analyzing any potential investment, especially during periods of market euphoria.

The Method: The "Post-Bubble Act" Investor Checklist

  1. 1. Vet the Business, Not the Story: Before you even look at a stock price, ask: What does this company actually do? How does it make money? Is there a real demand for its products or services? If you can't explain the business model to a ten-year-old, you should probably pass. The investors in the bubble company “for a purpose nobody knows” failed this first and most crucial test. This is the heart of maintaining your circle_of_competence.
  2. 2. Demand Substance Over Hype: Scrutinize the company's financial statements. Does it generate real, growing cash flow? Or is its survival dependent on constantly raising more money from investors? A great story can attract capital for a while, but only real profits can create sustainable value. The Bubble Act was created because companies with nothing but a story were running rampant.
  3. 3. Invert, Always Invert: As the great value investor Charlie Munger advises, “Invert, always invert.” Instead of only asking “How much can I make?”, first ask “How could this go terribly wrong?”. What could destroy this business? Could new technology make it obsolete? Could new regulations cripple it? Could competition erode its profits? The Bubble Act itself was a form of regulatory risk that crushed an entire class of companies overnight. Thinking about the downside is the bedrock of capital preservation.
  4. 4. Study the Promoters and Insiders: Who is running the company? Are they experienced operators with a history of creating long-term value? Or are they charismatic promoters skilled at selling stock? Look at what insiders are doing. Are they buying more stock with their own money, or are they selling large chunks to the public? The promoters of the South Sea Bubble became fabulously wealthy by selling their shares to a gullible public at the peak of the frenzy.

A Practical Example: The South Sea Bubble Unpacked

To understand the Bubble Act, you must understand the madness that birthed it.

^ Promoted Company ^ Stated Purpose ^

A company… For a wheel of perpetual motion.
A company… For the planting of mulberry trees and breeding of silkworms in Chelsea Park.
A company… For importing a number of large jack-asses from Spain.
A company… For a technology to make saltwater fresh.
A company… For carrying on an undertaking of great advantage, but nobody to know what it is.

* The Law and The Crash (The Unraveling): Ironically, the South Sea Company, wanting to eliminate its competition for investors' money, lobbied Parliament to pass the Bubble Act in June 1720. The Act succeeded in making these rival schemes illegal. However, it also forced the public to question the legitimacy of all companies without a charter—including, by implication, the South Sea Company itself. The spell was broken. The stock began to slide, then collapse. By the end of the year, it was back where it started, having wiped out the fortunes of thousands and plunging the British economy into a severe crisis. For a value investor, this story is a perfect, if tragic, illustration of a market completely untethered from reality, and the inevitable, painful crash that follows.

Legacy and Enduring Lessons

The Bubble Act was a flawed law, but its legacy is immense. It provides a balanced set of lessons about the strengths and limitations of regulation in a free market.

Its Lasting Impact (The "Strengths")

Its Crucial Lessons (The "Pitfalls")