When “the retirement of the baby boomers is expected to severely cut U.S. stock values in the near future,” is the ominous initial sentence from no lesser maintainer-of-the-status-quo than the San Francisco Fed's research department, one begins to recognize the Federal Reserve's overall need to hyper-inflate asset prices at whatever cost for fear of the ‘wealth' destruction looming. As the following study reports, projected declines in stock values – based on the latest demographic and valuation data – have become even more severe. Our current estimate suggests that the P/E ratio of the U.S. equity market could be halved by 2025 relative to its 2013 level.

Excerpted from FRBSF's Global Aging: More Headwinds for U.S. Stocks? (Liu, Spiegel, & Wang)…

Demographic patterns have a strong historical relationship with equity values in the United States (Liu and Spiegel 2011). In particular, the ratio of those people who are the prime age to invest in stocks to those who are the prime age to sell has historically served as a strong predictor of U.S. equity values as measured by price/earnings (P/E) ratios.

Research suggests one reason for this close relationship is a person's life-cycle pattern of investing. An individual's financial needs and attitudes toward risk change over the years. As retirement approaches, individuals become less willing to tolerate investment risks, so they begin to sell off stocks. Thus, the aging of the baby boomers and the broader shift of age distribution in the population should have a negative effect on capital markets (Abel 2001). In theory, global demographic changes may further impact U.S. equity values. For example, Krueger and Ludwig (2007) demonstrate that U.S. returns can import the adverse impact of population aging in other countries.

Since the study by Liu and Spiegel (2011), U.S. stock values have increased markedly. Between 2010, which is the end of their sample, and 2013, the Standard & Poor's (S&P) 500 Index has increased by 47% and the P/E ratio has increased from around 15 to nearly 17. However, the bearish predictions in Liu and Spiegel (2011), which were based solely on projected aging of the U.S. population, have worsened. Indeed, extending the Liu-Spiegel model's sample through 2013 suggests that the P/E ratio will decline even more, from about 17 in 2013 to 8.23 in 2025, before recovering to 9.14 in 2030.