January 28, 1986

January 28, 1986, became a striking test of whether a crowd of ordinary market participants could identify responsibility for a catastrophe before the cause was publicly known. After the Challenger exploded, investors rapidly singled out Morton Thiokol: its stock fell far more than those of the other contractors, anticipating the later finding that the company’s booster-rocket O-ring seals had failed in the cold. The episode gives the book’s question about crowd judgment an unnerving real-world answer.

Launch and Immediate Response

At 11:38 a.m., the Challenger lifted off from Cape Canaveral. Seventy-four seconds later, ten miles above the ground, it exploded. The launch had been televised, and news traveled quickly: the first report reached the Dow Jones News Wire eight minutes after the explosion.

Investors did not wait for a public explanation. They began selling shares in the four contractors involved in the launch: Rockwell International, which built the shuttle and its main engines; Lockheed, responsible for ground support; Martin Marietta, manufacturer of the external fuel tank; and Morton Thiokol, builder of the solid-fuel booster rocket. Twenty-one minutes after the explosion, Lockheed was down 5 percent, Martin Marietta 3 percent, and Rockwell 6 percent.

A Diverging Share Price

Morton Thiokol’s stock drew the strongest selling. With many investors trying to sell and few willing to buy, trading was halted almost immediately. When it resumed nearly an hour after the explosion, the stock was down 6 percent. By the close of the day, its loss had almost doubled to nearly 12 percent.

The other contractors followed a different course. Their stocks began to recover, and by the end of the day each had fallen only about 3 percent. The contrast made the market’s judgment legible in prices: investors were not merely marking down companies associated with a disaster but treating Morton Thiokol as the contractor most likely to face responsibility and serious financial consequences.

That signal arrived before public evidence had identified the company. Reports the next morning mentioned rumors, but neither implicated Morton Thiokol; the newspaper account said there were no clues to the cause. The speed of the market’s discrimination therefore became part of the puzzle, not simply a reaction to an announced finding.

The Cause Revealed

Six months later, the Presidential Commission on the Challenger revealed that the booster rockets’ O-ring seals, made by Morton Thiokol, became less resilient in cold weather. The seals were meant to keep hot exhaust gases from escaping. In the cold, they lost resilience, gaps opened, and gases leaked through; in the Challenger’s case, the escaping gases burned into the main fuel tank and caused the explosion.

At a congressional hearing, physicist Richard Feynman demonstrated the material’s vulnerability by dropping an O-ring into a glass of ice water. After he removed it, the lower temperature had made it brittle. The investigation held Morton Thiokol liable, while exonerating the other contractors. The finding thus aligned with the market’s strikingly uneven response on the day of the launch.

Significance and Limits

The episode’s force lies in its timing: within minutes of the explosion, and before public comments singled out Morton Thiokol, investors’ transactions had distinguished it from its three competitors. The later investigation supplied the causal explanation for the judgment embedded in the price decline.

The case does not prove that markets are invariably right. It was a single event, and the apparent accuracy might have been luck; the company’s business might have seemed especially vulnerable to a decline in the space program; or the trading halt itself might have made investors wary. The account nevertheless presents this day as an unusually clear instance of the market acting as a weighing mechanism: buyers and sellers, without an identified public accusation, collectively arrived at the company later held responsible.