I published a chart of PEMAX for the last 30 years on Saturday. PEMAX eliminates the distortion caused by cyclical earnings fluctuations, using the highest earnings to-date rather than current earnings. The idea being that cyclical declines in earnings reflect a fall in capacity utilization rather than a long-term drop in earnings potential.
Since then I have obtained long-term data dating back to 1900 for the S&P 500 and its predecessors, from multpl.com.
PEMAX for November 2017 is 24.34, suggesting that stocks are over-valued.
Outside of the Dotcom bubble, at 32.88, the current value is higher than at any other time in the past century. PEMAX at 24.34 is higher than the peak of 20.19 prior to the 1929 Black Tuesday crash, and higher than the 19.8 peak before Black Monday in 1987.
This does not mean that a crash is imminent but it does warn that investors are paying top-dollar for stocks. And at some point values are going to fall to the point that sanity is restored.
Robert Shiller’s CAPE ratio
Here is Robert Shiller’s CAPE ratio for comparison. CAPE attempts to eliminate distortion from cyclical earnings fluctuations by comparing current index values to the 10-year average of inflation-adjusted earnings.
While this works reasonably well most of the time, average earnings may be distorted by the severity of losses in the prior 10 years.
You are neither right nor wrong because the crowd disagrees with you. You are right because your data and reasoning are right.
~ Warren Buffett