CNBC

CNBC is presented as the most influential source of financial news during the late-1990s stock-market bubble: a network whose ceaseless reports did not merely describe investors’ actions, but helped make those actions respond to one another. Its significance lies in a paradox. Financial coverage could transmit information quickly, yet its visibility and timing encouraged investors to trade on the expectation that other investors would react, feeding the feedback loop of a market increasingly governed by the crowd.

Financial News at the Market’s Peak

The stock-market bubble of the 1990s coincided with an explosion of financial news. The Internet and cable television gave investors access to far more information about companies and markets than they had possessed a decade earlier. Within that changed landscape, CNBC became an unavoidable presence. At the market’s peak, seven million people watched it each week, and its reach extended beyond trading floors and brokerages to health clubs, restaurants, flower shops, oil rigs, factories, frat houses, judges’ chambers, and prisons.

CNBC’s prominence grew alongside the bull market. As Fortune columnist Andy Serwer observed, rising stock prices drew more people into investing, and more investors to the network to follow the action. The pattern captures a self-reinforcing cycle: market gains attracted attention, and attention increasingly centered on the market’s next move. CNBC was thus not simply a source consulted by a fixed audience; its popularity formed part of an environment in which stock-market activity became a widespread public preoccupation.

The network’s format made that environment immediate and continuous. A ticker ran ceaselessly along the bottom of the screen, while regular updates arrived from stock exchanges. In one sense, CNBC acted as a messenger, allowing the market to speak to itself. But as its popularity grew, its influence grew too. The crucial effect was not necessarily the substance of a particular report; it was that the report had been delivered through CNBC, where investors could expect others to see it as well.

Reports That Moved Prices

A study by economists Jeffrey Busse and T. Clifton Green examined the market’s response to positive reports about stocks on CNBC’s Midday Call segment. Prices moved higher within the first fifteen seconds after a segment appeared. More strikingly, the number of trades sextupled during the first minute. The rapid response showed how efficiently markets could incorporate new information, but the speed also raised a question about what traders were responding to: fifteen seconds left little time to assess whether the report’s reasoning was sound.

The book’s interpretation is that traders could act on the report’s public appearance rather than its informational content. If CNBC had named a stock, investors might anticipate that other viewers would trade on the mention; the immediate advantage went to whoever moved first. The network could therefore move a market without persuading viewers that a company’s prospects had changed. Its broadcast mattered partly because it coordinated expectations about what other investors would do.

That logic was explicit in the trading culture around the network. Day trader Ken Wolff described CNBC as a momentum-trading tool, while columnist and former hedge-fund manager James J. Cramer wrote about taking stock of a company when someone appeared on Squawk Box. These examples illustrate a form of market attention in which a broadcast appearance itself could serve as a trading cue. The report’s significance lay not only in what it said, but in the prospect that others were hearing it at the same time.

From Information to Herding

Before CNBC, traders had to infer what other people were thinking largely from the stock ticker. That left a space between an individual investor and the market: a person might try to interpret the ticker, but could not directly hear a continuous account of what traders supposedly thought or how the market supposedly felt. Financial news changed that relationship. Investors were repeatedly told what “traders” were saying and how “the market” was feeling, making inference less necessary and independent judgment harder to sustain.

This shared stream of commentary could magnify the interdependence of market decisions. In the book’s comparison to John Maynard Keynes’s beauty-contest metaphor, CNBC continually broadcast what everyone else was saying about who was prettiest. An investor deciding what a stock was worth faced not only the company’s prospects but also the public expectations that other investors might act upon. The informational environment thus invited a second-order calculation: not simply whether a stock was valuable, but how others would respond to the same news.

The pressure was especially acute when investors were already moving together. On a falling-market day, a CNBC screen displaying the headline MANIC MONDAY made the panic itself part of the visible information confronting investors. Their decisions were then shaped by the reaction on the screen as well as by the underlying market. Under those conditions, crowd behavior could become difficult to escape: each investor encountered evidence of what others were doing, and that evidence became another reason to follow them.

The Information Paradox

The network’s role in this account is not that it single-handedly created a financial bubble. Bubbles begin with real developments: bowling was popular in the 1950s, biotechnology changed the pharmaceutical industry, and the Internet was transformative. The danger arises when a reasonable attempt to benefit from a powerful trend becomes a market in which investors increasingly imitate one another. CNBC could intensify that process by making other people’s expectations unusually prominent, contributing to a feedback loop without originating it.

The book sets this problem against a broader principle of collective judgment. A group’s wisdom depends on a balance between information shared by everyone and information held privately by individual members. Independent information allows judgments to differ; a market can draw on those differences rather than simply reproduce one common view. During a bubble, expectations converge. The media may help that convergence along: booming markets leave little room for dissonant warnings, while falling markets make it hard to find voices arguing that panic is mistaken.

In this way, CNBC’s ceaseless coverage exposes an information paradox. More financial news does not automatically mean better collective knowledge. When reports become a common signal about what others are thinking, they can reduce the independence on which a group’s judgment depends. The network could make a market respond faster while making its participants more dependent on one another—and, as expectations narrowed toward the crowd’s view, a market could begin to behave like a mob.