Abstract
Opinions by media experts and pundits in both traditional media outlets and online venues influence investors. While a published opinion could be more accurate than that of a typical investor, its influence displaces many independent views and has the potential to introduce a shared error. My probabilistic trading model characterizes such influence and demonstrates how the “wisdom of the crowds” effect leads convergence of prices to the fundamental value. I use two corporate events to test the model, and find evidence consistent with the theoretical predictions.
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