Stages of a bubble

Minsky explains the engine; the economic historian Charles Kindleberger, in Manias, Panics, and Crashes (1978), turned it into a narrative anatomy that every bubble in history seems to follow. This is one of the highest-leverage templates in the whole program: once you can name the stages, you can locate any mania on the map, historical or the one you are living through, and the map tells you how the story tends to end. Learn the five stages as a sequence you can apply on sight.

What are the five stages of a bubble?

1. Displacement. An exogenous shock changes the profit landscape and creates a genuinely new opportunity, a real one, which is what makes bubbles so seductive. It might be a technology (railways, radio, the internet, AI), a financial innovation (investment trusts in the 1920s, securitization in the 2000s), a policy shift (deregulation, a sharp rate cut, the end of a war), or a new market opening. The key: the displacement is real, and early investors who see it are right. The internet really did change the world; house prices really had been stable; Japanese firms really were world-beating in 1985. Bubbles grow on a kernel of truth.
2. Boom (credit expansion). Investment and lending pour into the new opportunity. Prices rise on improving fundamentals, and at first entirely justified. And credit expands to fund it (via the credit cycle's loosening standards and financial innovation), which is what lets the boom outrun the cash the economy actually has. Rising prices attract more capital, which raises prices further. So far, so healthy: this stage is indistinguishable from a normal, sound expansion, which is why it is so hard to call the top early.
3. Euphoria (overtrading / mania). The break with reality. Prices detach from any defensible fundamental; valuation is abandoned in favour of narrative ("it's a new era," "this time is different," "they're not making any more land," "eyeballs matter more than earnings"). New and naive participants pile in because prices are rising (the price rise is the thesis, the definition of a bubble). Leverage peaks and Ponzi finance dominates (see the credit cycle): people buy not to hold an income-producing asset but purely to sell to a greater fool at a higher price. Skeptics are mocked and, often, fired or shorted into oblivion; "the market can stay irrational longer than you can stay solvent" (often attributed to Keynes, though no source in his writings has been found). This is the stage where fortunes are made on paper and where the seeds of ruin are fully sown.
4. Financial distress (profit-taking / the critical stage). The insiders and the smart money, who understand the fundamentals they abandoned on the way up, begin quietly to sell. The pool of new buyers thins; the marginal buyer (the last greater fool) is nearly exhausted. Prices stop rising and go sideways in an uneasy, high-volatility plateau. Early cracks appear: a prominent player fails, a fraud is revealed, a lender pulls back, a key financing market tightens. There is a growing, unspoken sense that the music might stop. That is distress. But the crowd, anchored to recent gains and hoping to sell "just before the top," stays in.
5. Revulsion (panic / crash). A trigger, often minor in itself but arriving when the structure is maximally fragile, flips sentiment from greed to fear, and everyone tries to exit at once. This is the Minsky moment made market-wide: forced selling, margin calls, a scramble for liquidity, a credit contraction, collapsing prices, and debt-deflation (see the credit cycle). Fear overshoots just as greed did; prices fall below fair value; solvent firms are dragged down with insolvent ones. Kindleberger's distinctive emphasis: the panic is stopped only by a lender of last resort, a central bank (or, internationally, a hegemon or the IMF) willing to "lend freely, against good collateral, at a penalty rate" (Bagehot, M7.02) to supply the liquidity everyone is scrambling for. Whether, how fast, and how competently that backstop arrives is often the difference between a sharp correction and a depression (contrast 1929 with 2008/2020).

How do you use the stages?

How to use the template. Two ways, and both are drilled in the app and the practice set:

• Diagnostically, on the present. When you find yourself thinking "this asset only goes up," run the checklist: Is there a real displacement? Has credit expanded to fund it? Has valuation been replaced by narrative? Is leverage/Ponzi finance rising? Are the insiders selling? The further down the list you tick, the later the stage and the thinner the margin of safety, a signal to reduce risk, without any pretence of calling the exact top (see the section on timing).
• Analytically, on history. Every case in seven cycles and crises is the same five stages in different costumes. Learning to map a case onto the anatomy (this was the displacement, this the euphoria, this the trigger, this the lesson) is exactly the graded skill of the mastery check, because it is the skill that lets you recognize the next one, which will look superficially nothing like the last.

A caution that the section on timing will hammer: the anatomy tells you the shape of the story and roughly how it ends, but not when. Euphoria (stage 3) can last months or years, and prices can double again after any sane observer has called the top. The template is for recognizing regime and excess and managing risk, not for timing the crash.