Social Media and Efficient Markets

  • Does Twitter make sell-side analysts better?
  • The answer, according to a new study, is yes.
  • Analysts are generally overly optimistic when presenting earnings forecasts (largely due to incentives).
  • As information technology has proliferated, the competition for information production has increased.
  • Negative and positive information are treated differently by human psychology – the former being valued more highly.
  • Analysts looking at Twitter succumb to this asymmetry, biasing their forecasts downwards i.e. negating their over optimism.
  • These are fascinating results (there a few others in the article).
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