Does the Investment Model Explain Value and Momentum Simultaneously?
Two innovations in the structural investment model go a long way in explaining value and momentum jointly. Firm-level investment returns are constructed from firm-level accounting variables, and are then aggregated to the portfolio level to match with portfolio-level stock returns. In addition, current assets form a separate production input besides physical capital. The model fits well the value, momentum, investment, and profitability premiums jointly, and partially explains the positive stock-investment return correlations, the procyclicality and short-term dynamics of the momentum and profitability premiums, and the countercyclicality and long-term dynamics of the value and investment premiums. However, the model fails to explain momentum crashes.
We have benefited from several helpful conversations on the aggregation issue with Frederico Belo. The views expressed herein are those of the authors and do not necessarily reflect the views of the National Bureau of Economic Research.