Boom and Bust Chapter 1: The Bubble Triangle

"Like a fire, a bubble requires three elements: oxygen, fuel, and heat." — Quinn and Turner

The Investment Context

In Boom and Bust, authors William Quinn and John D. Turner provide a comprehensive history of financial bubbles spanning three centuries. To explain why markets periodically lose their minds, they developed the "Bubble Triangle" framework. Just as a physical fire requires oxygen, fuel, and heat to ignite and sustain itself, a financial bubble requires three necessary elements:

1. Marketability (Oxygen): The asset must be easy to buy and sell.
2. Money and Credit (Fuel): There must be abundant cheap money and leverage available to buyers.
3. Speculation (Heat): There must be a compelling story or new technology to generate excitement and greed.

If any of these three elements is missing, a true bubble cannot form.

The Wall Street Translation

For the active investor, the Bubble Triangle is a diagnostic tool. You can use it to determine if a booming sector is experiencing a healthy bull market or a dangerous bubble.

1. The Role of Marketability: Before the invention of joint-stock companies, you couldn't easily trade pieces of businesses. Today, with zero-commission brokerages and crypto exchanges, marketability (oxygen) is infinite. This makes modern markets more prone to bubbles, not less.
2. The Narrative Heat: Humans are wired for stories, not spreadsheets. A true bubble requires a narrative that "this time is different." Whether it's the railroads in the 1840s, the internet in 1999, or AI today, the story must be compelling enough to override traditional valuation metrics.
3. The Necessary Illusion: During the ascent of a bubble, the triangle feels like a virtuous circle. High prices generate exciting stories, which attract more credit, which drives prices even higher.

Actionable Trading Rules

1. Check the Triangle: When everyone is talking about a hot new asset class, check the triangle. Is it highly tradable? Is there easy margin debt? Is the narrative euphoric? If yes to all three, you are looking at a bubble.
2. Don't Short the Oxygen: Knowing an asset is in a bubble does not mean you should short it. A fire with unlimited oxygen and fuel can burn much higher and longer than your solvency permits.
3. Recognize the Environment: In an era of infinite marketability (oxygen), your primary focus for identifying bubbles should be on the other two elements: the prevailing narrative (heat) and central bank liquidity (fuel).