The Bubble Is Different This Time

 | Apr 27, 2017 11:01AM ET

Just recently, Wealth Management had an interesting interview with Jeremy Grantham in which Jeremy suggests the “rules have changed” for value investors. To wit:

The market was extremely well-behaved from 1935 until 2000. It was an orderly world in which to be a value manager: there was mean reversion. If a value manager was patient, he was in heaven. The market outperformed when it was it cheap, and when it got expensive, it cracked.

Since 2000, it’s become much more complicated. The rules have shifted. We used to say that this time is never different. I think what has happened from 2000 until today is a challenge to that. Since 1998, price-earnings ratios have averaged 60 percent higher than the prior 50 years, and profit margins have averaged 20 to 30 percent higher. That’s a powerful double whammy.

He is correct. As shown below, the average CAPE ratio leve rose, beginning in 1980 to 21.67 from the average of 14.42 over the previous 80-years.