John Authers, Columnist

No, This Isn't a Repeat of the Dotcom Crash. Yet

For one thing, the bubble this time is in the monopoly profits of the leading tech companies, rather than their valuations.

This is a sequel, not a rerun.

Photographer: Klaus Vedfelt/Vision Media/Getty Images

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So that made a change. In absolute terms, a lot of money was lost Thursday as U.S. stocks had their biggest sell-off since June. For the most spectacular example, Apple Inc., still the world’s first and only $2 trillion company, has lost $219 billion in market cap in the two trading days since the close Tuesday. For context, that is roughly the value of Merck & Co. or Intel Corp., and is much bigger than the total current market cap of Exxon Mobil Corp., for long the world’s largest company.