In 2004 I did a study of demographics and equity returns. It predicted that if the market behaved as it had in the past demographic cycle that the peak in stock prices would be in 2006 and the trough will be in 2022. The flaw in the study is that it assumes peaks and troughs are due solely to demographics and that the demographic effect is due solely to the peak and trough birth years. If there were some way to determine how people accumulate or distribute stocks as a function of age the second flaw could be overcome.
So to do this, I followed the very simplistic process of matching the peaks and troughs in the number of births with the peaks and troughs in the stock market using various lag times and assumed that relationship will carry forward. The census only has records from 1909 and from there the first birth peak was in 1919, the first birth trough was in 1935, the second birth peak was in 1959 and the second birth trough was in 1975 (all averaged). My assumption was therefore that the 1966 stock market peak would match 2006 and the 1982 stock market trough would match 2022.
My initial response to the Vanguard
paper is that they are muddying the water. The amazing thing about the Vanguard
paper is they don't even show a graph of the number of US births over time and compare it to the movement of the stock market.
There can be all kinds of goofy things that happen from 2006 to 2022 that have nothing to do with demographics but the bottom line is that the peak birth cohort from 1957-1961 should be selling more stocks than buying the closer it is to 2022 and beyond with no new cohort to pick up the slack until after 2022 when the Millenials will theoretically have the numbers and income to do so from their first peak births from 1990-1992. This would correspond to the initial surge in Baby Boomer births 40 years earlier which in theory helped lift the stock market off the 1982 trough.
While the periphery breaks down rather slowly at first, the capital cities of the hegemon should collapse suddenly and violently.