The Impact of Population Aging on Financial Markets

A number of financial market analysts have argued that the aging of the "Baby Boom" cohort contributed to the rise U.S. asset values during the 1990s, and that asset prices will decline when this group reaches retirement age and begins to draw down its wealth. This paper explores the importance of changing demographic structure for asset returns, asset prices, and the composition of household balance sheets in the United States. Standard models suggest that equilibrium returns on financial assets will vary in response to changes in population age structure. While the direction of the effect of demographic changes is not controversial, the quantitative importance of such changes for financial markets is open to debate. The paper presents several strands of empirical evidence that bear on this issue. First, it describes current age-specific patterns of asset holding in the United States, and finds that asset holdings rise sharply when households are in their 30s and 40s. Aside from the automatic decline in the value of defined benefit pension assets as households age, however, other financial assets decline only gradually during retirement. When these data are used to project asset d