If the experience of the past 125 years is a relevant guide for the future behavior of
Nothing about this data should look surprising to an experienced investor. Indeed, something very close to this same distribution of possible market outcomes has been programmed into the financial planning software used by most professional investors for at least the past three decades
To address this question, I segmented the 125-year history of the market index into quartiles based on the level of the Shiller P/E Ratio as of each month-end dating back to 1884. I then measured the return distributions associated with the lowest and highest quartiles for the Shiller P/E Ratio to search for differences between the two. The difference was material!