We document a novel channel through which coordinated noise trading exerts externalities on financial markets dominated by institutional investors. We exploit a unique set of events where Chilean pension fund investors followed an influential financial advisory firm that recommended frequent switches between equity and bond funds. The recommendations, which mostly followed short-term trends, generated large and coordinated fund flows. These flows resulted in substantial price pressure and increased volatility in financial markets. Pension funds increased cash holdings as a response. Our findings suggest that giving retirement savers unconstrained reallocation opportunities may exert negative externalities on financial markets.
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