The image here is
of the efficient- market- believing fi nance professor who takes a walk with a student.
“Isn’t that a $10 bill lying on the ground?” asks the student.
“No, it can’t be a $10 bill,” answers the professor. “If it were,
someone would have picked it up by now.”
The professor walks away, and the student picks it up and has
a beer.
28
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Similar ideas to Believer vs Non believers of EMH
• Investors are right (and wrong) all the time for the “wrong reason.” Someone buys a stock because he or she expects a certain development; it doesn’t occur; the market takes the stock up anyway; the investor looks good (and invariably accepts credit).
• The correctness of a decision can’t...
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