We provide evidence that agents have slow‐moving beliefs about stock market volatility that lead to initial underreaction to volatility shocks followed by delayed overreaction. These dynamics are mirrored in the VIX and variance risk premiums, which reflect investor expectations about volatility, and are also supported in both surveys and firm‐level option prices. We embed these expectations into an asset pricing model and find that the model can account for a number of stylized facts about market returns and return volatility that are difficult to reconcile, including a weak or even negative risk‐return trade‐off.

We study data on commercial banks and securities firms across multiple countries since 1870. Balance sheet expansion of leveraged intermediaries negatively predicts returns of stocks, bonds, currencies, and housing. The predictability is stronger at shorter horizons, is robust to macroeconomic controls, and holds outside distress periods, in contrast to models featuring nonlinearities during distress. Intermediaries in global financial centers predict international equity returns. A new data set on individual stock holdings of Japanese intermediaries since 1955 shows intermediaries affect returns of stocks directly held. Our results suggest a strong universal link between intermediaries and asset returns distinct from macroeconomic channels.