Goldfarb and Kirsch examined how major technological innovations can -but do not always - produce financial bubbles. They define a bubble as an extreme price fluctuation driven by “foolish” behavior, where investors pay far more for an asset than its future profits or fundamental value can justify.
High Uncertainty
A bubble cannot form if the path to profitability is clear and predictable. There must be profound uncertainty surrounding the new innovation. This isn’t just technological uncertainty (whether the tech will actually work), but also competitive, regulatory, and business model uncertainty. No one truly knows how the technology will be monetized, who the dominant players will be, or how large the market will actually get.
- The Business Model Void: Companies didn’t know if the internet would be monetized through subscription fees, advertising, or direct e-commerce.
- Case in point (Webvan): Webvan was an online grocery delivery startup that raised hundreds of millions of dollars. The uncertainty lay in the logistics: they built massive, automated warehouses before ever proving that people actually wanted to buy groceries online or that the delivery economics made sense. The uncertainty was ignored, the model failed, and the company went bankrupt in 2001.
A Persuasive Narrative
Because there is so much uncertainty and a lack of reliable financial metrics, storytelling takes over. A compelling, easy-to-understand narrative emerges about how this specific technology will revolutionize society or create a utopian future. This narrative acts as a substitute for hard data, coordinating the beliefs of the masses and fueling hype.
- The Story: Investors were told we had entered a “New Economy.” Traditional metrics like Price-to-Earnings (P/E) ratios were dismissed as outdated. Instead, the narrative focused on “eyeballs,” “clicks,” and “capturing market share at all costs.”
- The Effect: The narrative was so blindingly persuasive that a company could simply add “.com” to the end of its name or “e-” to the beginning (name changes known as “dot-com additions”) and see its stock price surge identically to companies actually doing tech work.
Novice investors
Bubbles require an influx of “naïfs”—inexperienced retail investors who lack the financial tools, historical context, or technical expertise to properly evaluate the asset’s reasonable price. Driven by biases, sensationalist media coverage, a fear of missing out (FOMO), and herd mentality, these novices buy into the narrative without understanding the underlying risks.
- 1990s E-Trade Era: The late 90s saw the birth of accessible online trading platforms like E-TRADE. For the first time, everyday people—plumbers, teachers, and dentists—quit their jobs to become “day traders.” They poured their retirement savings into tech IPOs they didn’t understand because their neighbors were supposedly getting rich doing the same thing.
- 1920s Radio Boom: Similarly, in the 1920s, elevator operators and shoe-shiners were trading stock tips on the Radio Corporation of America (RCA). RCA’s stock price surged from $85 in 1928 to $500 in 1929, driven almost entirely by the public’s naive fascination with the “magic” of wireless audio.
Pure Play Companies
For a bubble to inflate, investors need a direct, uncomplicated way to place their bets. “Pure play” companies are businesses whose entire existence and valuation are tied exclusively to the new technology. Instead of investing in a diversified conglomerate that happens to be experimenting with the tech, investors pour capital into these specialized startups, driving their stock prices to irrational heights.
- The Dot-Com Poster Child: Pets.com is the ultimate pure play example. They did not have brick-and-mortar stores; their entire existence was staked on the premise that people would buy pet food over the internet.
- The Contrast: Compare Pets.com to an established company like Walmart experimenting with a website. If the internet turned out to be a fad, Walmart still had thousands of physical stores generating revenue to survive the crash. Pets.com had no backup plan. When the internet hype met the harsh reality of high shipping costs for heavy bags of dog food, the pure play company collapsed, going from a high-profile IPO to liquidation in less than a year.
How the Factors Are Connected
These four factors do not operate in isolation; they feed into one another in a cascading chain reaction that turns a technological breakthrough into a financial mania.
The Void
It starts with a technological breakthrough that introduces massive Uncertainty into the market. Because the technology is so new, standard valuation methods (like analyzing revenue or total assets) don’t apply yet.
The Story
To fill this void of measurable data, early adopters and promoters generate a powerful Narrative. This story frames the innovation as a guaranteed world-changer, shifting the focus away from current profitability and toward an idealized future.
The Magnet
This hyped narrative acts as a magnet for Novice Investors, who are easily persuaded by the promise of quick wealth and societal transformation. They aren’t looking at spreadsheets; they are investing in the story.
The Vehicle
Finally, Pure Play Companies provide the necessary vehicle for this speculative frenzy. They allow the flood of novice capital to concentrate directly on the hyped technology. As money pours into these specific, highly volatile stocks, prices detach entirely from reality—and the bubble is born.
When the narrative inevitably clashes with the reality of the business model’s uncertainty, the novice investors panic, the pure play companies run out of capital, and the bubble bursts.