Benefits of Contribution: Individual Asset Allocation, Diversification and Welfare in a Defined Contribution Pension System

We analyse the new Swedish pension system, which constitutes a partial defined contribution plan where individuals can choose from hundreds of mutual funds to invest part of their pension savings, making them bearing part of the investment risks themselves. We perform a factor analysis in order to explore the actual asset classes that are driving the returns of the mutual funds available to individuals. The large amount of mutual funds can be represented with only a few orthogonal factors or distinct asset classes. Moreover, we investigate individuals ’ asset allocation choices and relate individuals ’ factor exposures to a number of demographic and socio-economic variables in order to find out who holds what, and whether asset allocation and diversification differ with respect to individual characteristics. We find that sophisticated individuals are more likely be active participants in the pension system and tend to load less on a general index factor and bond factors than less sophisticated individuals. Moreover, we find significant differences in individuals ’ portfolio performance, the most eye-catching result being that men show better performance than women. We argue that systematic differences in asset allocation and performance might give rise to unwarranted distribution effects in the new pension system