The thing about a market bubble is that you don't really know how big it is until it pops. So it doesn't pop, and doesn't pop, and doesn't pop, until one day it finally pops. And by then it's too late.
The dot-com collapse two decades ago erased $5 trillion in investments. Ever since, people in Silicon Valley have tried to guess exactly when the next tech bubble will burst, and whether the latest wave of investment in tech startups will lead to an economic crash. “A lot of people who are smarter than me have come to the conclusion that we're in a bubble,” said Rita McGrath, a professor of management at Columbia Business School. “What we're starting to see is the early signals.”
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