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The Dot-Com Bubble

How a real technology revolution and a surge in productivity fed a stock boom that ran far ahead of profits, with the Nasdaq rising almost seven-fold in five years, why early warnings went unheeded, how the market lost 78% from its peak, the analyst conflicts that came to light afterward, and what the episode teaches about paying for growth.

Lesson 8 of 14 · 6 min read · Advanced · Members · Last reviewed October 2026

The short version

The internet and a jump in productivity growth were real. But by March 10, 2000, the Nasdaq Composite had risen almost seven-fold from the end of 1994, including 86% in 1999 alone. In 1999 and 2000, 856 companies went public in the US, 78% of them losing money, and their shares rose an average of 65% on the first day of trading. Alan Greenspan had asked about "irrational exuberance" back in December 1996, after which the Nasdaq nearly quadrupled. From its peak it fell 78% by October 2002, and the S&P 500 lost 37% over 2000 to 2002 with dividends. Ten investment firms later paid $1.4 billion to settle charges over conflicts between their research and banking. The Nasdaq took until April 2015 to regain its 2000 peak.

By the end of this lesson, you'll be able to

  • Describe how real technological change and investor enthusiasm combined to drive the late-1990s boom
  • Explain why warnings about overvaluation were hard to act on, and what a high price assumes about a company's future
  • Describe the bust, its effect on stocks, bonds, and the economy, and the reforms aimed at analyst conflicts

Why this matters

The dot-com bubble is the modern example of a boom built on something real. The internet did change the economy, and productivity growth really did speed up. Yet the Nasdaq Composite, the index most associated with technology stocks, lost 78% from its peak and took 15 years to get back.1 It's the clearest lesson that a good story and a good investment aren't the same thing: the price you pay decides which one you get.

The real part

The late 1990s brought a genuine surge in productivity. Output per hour in the US nonfarm business sector grew about 1.5% a year from 1973 to 1995, then about 3.0% a year from 1995 to 2000.2 Ben Bernanke, then a Fed governor, argued in 2002 that at least some of the run-up in stock prices in the late 1990s was apparently justified by fundamentals, including the remarkable growth in output and productivity.3

The boom

Stocks rose in an extraordinary run. The S&P 500 returned more than 20% in every year from 1995 to 1999, with dividends, a combined gain of about 248%.4 Technology went further. The Nasdaq Composite closed 1994 at 752 and peaked at 5,048.62 on March 10, 2000, almost seven times higher. It rose 86% in 1999 alone, and 256% in the 17 months from its low in October 1998.1

New companies rushed to sell shares to the public. In 1999 and 2000, 856 companies went public in the US. 74% of them were technology companies, 78% were losing money, and their shares rose an average of 64.6% on their first day of trading, against 14.8% for initial public offerings from 1990 to 1998.5

Worked example: what a bubble-era price assumes (hypothetical)
StepFigure
Market value of a young internet company$5 billion
Its sales this year$100 million, and losing money
Profit needed to justify $5 billion at 20 times earnings$250 million a year
Sales needed for that profit at a 10% profit margin$2.5 billion, 25 times today's

Even if the company grows 25-fold and becomes solidly profitable, a buyer at $5 billion only breaks even, ignoring the years of waiting. The price already assumed spectacular success. Anything less, a competitor, a slower market, thinner margins, meant a large loss even for a company that thrived.

The rest of this lesson is for members

Still to come in this lesson: The warnings, The bust, The conflicts that came to light, The long road back, the key takeaways, and 2 quiz questions with explanations.

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Notes and sources

  1. Federal Reserve Bank of St. Louis (FRED), from Nasdaq OMX Group. NASDAQ Composite Index (NASDAQCOM), daily close. Checked 2026-11-02. Back to text
  2. Federal Reserve Bank of St. Louis (FRED), from the U.S. Bureau of Labor Statistics. Nonfarm Business Sector: Labor Productivity (Output per Hour) for All Workers (OPHNFB), quarterly. Checked 2026-10-17. Back to text
  3. Board of Governors of the Federal Reserve System. Ben S. Bernanke, Asset-Price "Bubbles" and Monetary Policy, remarks before the New York Chapter of the National Association for Business Economics (October 15, 2002). Checked 2026-10-17. Back to text
  4. Aswath Damodaran, NYU Stern School of Business. Historical Returns on Stocks, Bonds and Bills, with annual data through 2025 (updated January 2026). Checked 2026-11-02. Back to text
  5. Jay R. Ritter, University of Florida. Initial Public Offerings: Updated Statistics (October 2026), tables 1 and 9. Checked 2026-10-17. Back to text
  6. Board of Governors of the Federal Reserve System. Alan Greenspan, The Challenge of Central Banking in a Democratic Society, remarks at the American Enterprise Institute (December 5, 1996). Checked 2026-10-17.
  7. Board of Governors of the Federal Reserve System. Open Market Operations archive: changes in the intended federal funds rate, 1990 to 2008. Checked 2026-10-17.
  8. National Bureau of Economic Research. US Business Cycle Expansions and Contractions. Checked 2026-10-14.
  9. U.S. Securities and Exchange Commission. Ten of Nation's Top Investment Firms Settle Enforcement Actions Involving Conflicts of Interest Between Research and Investment Banking, press release 2003-54 (April 28, 2003). Checked 2026-10-17.