Diagnostic Expectations and Stock Returns

Pedro Bordalo, Nicola Gennaioli, Rafael La Porta and Andrei Shleifer

Journal of Finance, 2019, vol. 74, issue 6, 2839-2874

Abstract: We revisit La Porta's finding that returns on stocks with the most optimistic analyst long‐term earnings growth forecasts are lower than those on stocks with the most pessimistic forecasts. We document the joint dynamics of fundamentals, expectations, and returns of these portfolios, and explain the facts using a model of belief formation based on the representativeness heuristic. Analysts forecast fundamentals from observed earnings growth, but overreact to news by exaggerating the probability of states that have become more likely. We find support for the model's predictions. A quantitative estimation of the model accounts for the key patterns in the data.

Date: 2019
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https://doi.org/10.1111/jofi.12833

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Working Paper: Diagnostic Expectations and Stock Returns (2017)
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