What was the dot-com bubble? Why it grew and burst

The dot-com bubble was a stock market boom in internet companies from about 1995 to 2000, when investors paid huge prices for businesses, many with no profits, on the bet that the web would change everything. The Nasdaq Composite, the index full of tech stocks, peaked on 10 March 2000 and then fell 78% by October 2002. The internet did change everything; most of the companies didn't survive to see it.

In short

• Cheap money, a real technological shift and a rush of first-time investors pushed internet stocks to prices their profits could never justify.
• The crash began in March 2000, took 31 months to hit bottom, and helped bring on a mild US recession in 2001.
• A few companies, such as Amazon and eBay, survived and grew enormous; hundreds, like Pets.com, vanished.

How did the dot-com bubble start?

It started with something real. In the early 1990s the internet opened to ordinary people and businesses, and the World Wide Web gave it a friendly face. On 9 August 1995, Netscape, maker of the most popular web browser, sold shares to the public for the first time at $28 each. They closed their first day at $58.25, though the company had never earned a profit. Many date the mania from that day.

Several forces then fed each other. US interest rates were moderate and the economy was growing strongly, so money was easy to raise. Venture capital firms funded start-ups to grow fast and worry about profits later. New online brokers let millions of people trade stocks cheaply from home, many for the first time. And the story was simple and exciting: the web would remake shopping, media and communication, so the companies that claimed the territory first would win.

Why did the prices get so high?

Investors stopped valuing companies by their earnings and started valuing them by "eyeballs", page views and growth. Companies added ".com" to their names and their shares rose. Start-ups raced to sell shares to the public, often within a few years of founding, and many doubled or more on their first day of trading.

As early as 5 December 1996, Federal Reserve Chair Alan Greenspan asked in a speech how anyone could know when "irrational exuberance has unduly escalated asset values". The Nasdaq Composite, at about 1,300 that month, went on to close at a record 5,048.62 on 10 March 2000.

Why didn't skeptics push prices back down? The economists Eli Ofek and Matthew Richardson, in their study DotCom Mania, found that betting against internet stocks by short selling was close to its practical limit. Optimists set the price while pessimists stayed on the sidelines. Many newly listed companies had sold only a small slice of their shares, with insiders barred from selling the rest for several months under lock-up agreements, so the supply of shares was artificially small. When those lock-ups expired and more sellers arrived, prices fell.

A timeline of the boom and the bust

Date	What happened
9 August 1995	Netscape goes public; its shares roughly double on the first day
5 December 1996	Greenspan's "irrational exuberance" speech
June 1999 – May 2000	The Federal Reserve raises its key rate from 4.75% to 6.5%
January 2000	AOL agrees to buy Time Warner, one of the largest mergers ever announced
February 2000	Pets.com goes public at $11 a share
10 March 2000	The Nasdaq Composite closes at its peak, 5,048.62
November 2000	Pets.com shuts down, nine months after its share sale
March – November 2001	The US is in recession, by the NBER's dating
9 October 2002	The Nasdaq hits bottom at 1,114.11, down 78%
23 April 2015	The Nasdaq finally closes above its 2000 record

Why did the bubble burst?

No single event popped it. Rising interest rates made future profits worth less today and borrowing dearer. Start-ups that had lived on investors' cash began to run out, and investors stopped handing over more. Lock-up expirations brought a wave of new sellers. Once prices began to fall, the same feedback that had driven them up ran in reverse: falling prices scared investors, who sold, which pushed prices down further.

The damage spread beyond websites. Telecom companies had borrowed heavily to lay far more fiber-optic cable than the internet of the time could use, and many went bankrupt. Accounting scandals at Enron in 2001 and WorldCom in 2002 shook trust in what companies reported, and Congress answered with the Sarbanes-Oxley Act in 2002. The 2001 recession, which the NBER dates from March to November, was mild by historical standards, and the terrorist attacks of 11 September fell in the middle of it. The Federal Reserve cut its key rate from 6.5% at the start of 2001 to 1.75% by the end.

What does a bubble look like, step by step?

Economists who study bubbles, from Hyman Minsky to Charles Kindleberger, describe a common shape, and the dot-com years fit it closely.

1. Displacement: a real change, here the web, opens new ways to make money.
2. Boom: early investors make large gains, and cheap credit lets others follow.
3. Euphoria: prices lose touch with earnings, and new ways of valuing companies are invented to justify them. The phrase "this time is different" is the warning sign.
4. Profit-taking: insiders and careful investors begin selling quietly.
5. Panic: prices fall, everyone heads for the exit at once, and the fall overshoots.

Bubbles usually form around real innovations, which is what makes them hard to spot from inside. The same shape fits the railway mania of the 1840s and, in a different form, the housing boom that ended in the 2008 financial crisis.

Which companies survived, and what did the bubble leave behind?

Amazon's shares fell by more than 90% from their 1999 high, but it kept selling books, then everything else, and became one of the world's largest companies. eBay, which made money from the start, and Priceline, now Booking Holdings, came through. Google was founded in 1998 and went public in 2004, after the crash. Pets.com, Webvan, an online grocer, and many others ran out of cash and closed.

The bust also left useful things behind. The fiber laid during the boom, bought cheaply out of bankruptcy, carried the broadband and video that followed. Many engineers trained in failed start-ups built the next wave of companies. Investors learned, for a while, to ask about profits again. It took the Nasdaq more than 15 years, until 23 April 2015, to close above its March 2000 record.

Still argued

Since 2023, investors and economists have argued about whether the boom in artificial intelligence stocks resembles the dot-com bubble. Those who see parallels point to heavy spending on data centers ahead of proven profits and to a market led by a few technology giants. Those who see differences point out that today's leading companies earn large profits, unlike most dot-com firms, and pay for much of their spending from their own cash. Nobody can know in advance which reading is right, and this note makes no prediction. It explains history; it isn't financial advice.

The bubble is a lesson in a central idea of economics: prices reflect what people expect, and expectations can run far ahead of what is real, even when the underlying change is genuine.

Check yourself

• Explain to a friend why a real technology can still produce a bubble.
• What role did lock-up agreements and short-selling limits play in keeping prices high?
• Walk through the five stages of a bubble using the dot-com years as the example.

Sources

• The Challenge of Central Banking in a Democratic Society — Alan Greenspan, Federal Reserve Board, 1996
• DotCom Mania: The Rise and Fall of Internet Stock Prices — Eli Ofek and Matthew Richardson, NBER, 2001
• US Business Cycle Expansions and Contractions — National Bureau of Economic Research
• Nasdaq surpasses internet bubble peak to set new record — Fortune, 2015
• Dot-com bubble — Wikipedia