Complementary Information and Learning Traps

Annie Liang, Xiaosheng Mu

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


We develop a model of social learning from complementary information: short-lived agents sequentially choose from a large set of flexibly correlated information sources for prediction of an unknown state, and information is passed down across periods. Will the community collectively acquire the best kinds of information? Long-run outcomes fall into one of two cases: (i) efficient information aggregation, where the community eventually learns as fast as possible; (ii) "learning traps," where the community gets stuck observing suboptimal sources and information aggregation is inefficient. Our main results identify a simple property of the underlying informational complementarities that determines which occurs. In both regimes, we characterize which sources are observed in the long run and how often.

Original languageEnglish (US)
Pages (from-to)389-448
Number of pages60
JournalQuarterly Journal of Economics
Issue number1
StatePublished - Feb 1 2020

ASJC Scopus subject areas

  • Economics and Econometrics


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