What Is a Market Bubble?

What Is a Market Bubble?

A bubble forms when a price detaches from reality. Buyers stop asking what something is worth and start buying because it is going up and they do not want to miss out. The classic examples, from tulips to dot-com stocks to crypto manias, all share the same shape: a self-reinforcing climb powered by belief rather than value. At its core a bubble is a feedback loop of greed, rising prices attract buyers, whose buying lifts prices further, which attracts still more buyers, until the price bears almost no relationship to the underlying asset.

The Five Stages of a Bubble

The economist Hyman Minsky described how bubbles tend to move through five recognisable stages, a model worth knowing because it repeats:

1. 1.Displacement: a genuine innovation or trend, a new technology, low rates, a real story, attracts early money.
2. 2.Boom: prices rise, the story spreads, media attention grows and more buyers pile in.
3. 3.Euphoria: caution evaporates, FOMO takes over, price detaches from value and "this time is different" becomes the mantra.
4. 4.Profit-taking: the early, informed money quietly recognises the excess and begins to sell.
5. 5.Panic: belief cracks, buyers vanish, and the price collapses far faster than it climbed.

Not every bubble fits this neatly, but the arc, a real seed, a euphoric overshoot, a brutal collapse, is remarkably consistent.

Famous Bubbles In History

Bubbles are not a modern quirk; they recur across centuries because human nature does. The Dutch Tulip Mania of the 1630s saw single tulip bulbs trade for the price of a house before collapsing. The South Sea Bubble of 1720 ruined fortunes across Britain, even, famously, Isaac Newton’s. The Roaring Twenties ended in the 1929 crash and the Great Depression. The dot-com bubble of the late 1990s sent internet stocks to absurd valuations before wiping out trillions in 2000. The 2008 financial crisis grew from a housing and credit bubble. And crypto has had several of its own, from the 2017 ICO mania to memecoin frenzies. Different assets, different eras, the same story: a real or imagined opportunity, inflated by greed into a mania, ending in a crash. Studying them is the best inoculation against being caught in the next.

Why Bubbles Are So Hard to Spot

If the pattern is so consistent, why does almost everyone get caught? Because from the inside, a bubble does not feel like a bubble, it feels like a once-in-a-lifetime opportunity you would be foolish to miss. During the boom and euphoria stages, prices really are rising and early buyers really are getting rich, which seems to validate the mania and silences the doubters. The phrase "this time is different" is the most expensive in finance precisely because, in the moment, there is always a compelling story for why the old rules no longer apply. Even seasoned professionals are routinely swept up, partly through genuine belief and partly through the greater-fool logic of expecting to sell to someone else before the music stops. Certainty about a bubble usually only arrives after it has burst, which is exactly why a measure of crowd emotion is so valuable: it can flag the dangerous euphoria that price alone disguises as success.

Why Is Extreme Greed the Warning Sign?

Because a bubble is greed with no brakes. When emotion drives markets to the point where almost everyone is euphoric and already invested, there is little buying power left to sustain the climb. That is why extreme greed readings cluster near bubble peaks, and why the purest bubbles, like memecoins with almost nothing underneath, run the hottest of all: CFGI scored Shiba Inu at an extreme-greed 95, and its market record high sits at 87. No reading calls the top, but watching the mood reach an extreme is more useful than watching the price alone, because it puts a number on the euphoria a bubble disguises as healthy growth. See it on the live index, and read the flip side in what a market crash is.