What Is a Financial Bubble? A History of Booms and Crashes
What is a financial bubble?
A financial bubble forms when the price of an asset climbs far above what it’s actually worth, driven by optimism and borrowed money, until confidence breaks and the price collapses. This free clip from When Bubbles Burst traces that pattern across centuries — the same rise, mania and panic recurring from early speculative manias through to 2008.
Why bubbles keep repeating
The mechanics are well understood, which is what makes the recurrence hard to explain — until you look at what each cycle has in common.
Every bubble arrives with a story that makes it sound reasonable. A new technology, a new financial instrument, a new era in which the old limits supposedly no longer apply. That story does real work: it lets buyers read rising prices as evidence of value rather than of enthusiasm, and it discourages the awkward question of what the asset is actually worth.
Credit does the rest. Borrowed money magnifies both the climb and the fall, and draws in people who would never have taken the same risk with their own capital.
Then distance obscures it. Once a loan is packaged and resold, whoever created the risk no longer carries it. Vik, a Norwegian municipality, placed public funds in securities sold as triple-A savings; they turned out to be tied to American subprime mortgages that nobody in Vik was in a position to assess. The decision and its consequences ended up on different continents.
And memory is short. Roughly a generation separates most major crashes — long enough for the people who lived through the last one to have left the room.
From early manias to 2008
The pattern predates modern finance. Britain’s canal mania of the 1790s drew money into waterways that could never carry enough freight to repay it. The railway mania of the 1840s repeated the exercise on a far larger scale… The 1920s brought electrification, the motor car and the radio, and ended in 1929. The 1990s brought the internet, and ended in 2000.
…Something is usually left behind. The canals were dug, the track was laid, the fibre was buried. The investors were ruined; the infrastructure stayed.
2008 subprime mortgage crisis broke that consolation. What the boom left behind was not new infrastructure but debt.
