How did the stock market single out Morton Thiokol within minutes of the Challenger explosion, months before the official inquiry?
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The claims of the efficient markets hypothesis
List no free lunch, prices fully reflecting available information, random walks, the risk–return trade-off and no value from active management, and note the course tools that rely on market prices.
Contractor stock prices on January 28, 1986
Record the timeline from the 11:39 a.m. explosion through Thiokol's trading halt, compute one interval return from the price table, and contrast Thiokol's roughly 12% daily fall with the other three.
The market's verdict against the Rogers Commission
State the commission's June 9 O-ring finding against Thiokol, and set the roughly 4.6% fall predicted from NASA sales shares beside the actual 12%.
The wisdom of crowds
State that prices aggregate dispersed information into one verdict even though no single participant knows the answer, with the Challenger case as the example.