Value and momentum - why do they both work?
Two of the most important factors for investors are value and momentum. These are factors that can both easily be exploited and accessed in the market. Value indices are relatively easy to create using a simple set of rules. Momentum is also easy to create through rules or through specific fund styles. Nevertheless, the stories used to explain the excess returns in value and momentum are very different. A simple matrix based on five criteria can be used to explain the difference between these two factors. The approach of the value factor is to look for cheapness or richness relative to other securities in a portfolio. For momentum, it is looking for assets where there have been high gains versus declines. For a risk-based story for the excess returns associated with value, there is the view that investors are compensated for risk from firms that may be out of favor. In the case of momentum, there is the story that excess returns are associated with econom...