Have the record number of investors in the stock market lost their minds?

Re:Have the record number of investors in the stock market l... by mrep on Saturday May 16, 2020 @12:26PM (#23204804)

The Shiller Price earnings ratio is based on average inflation-adjusted earnings from the previous 10 years and the recent earnings weren't really affected by the virus yet and thus the current 10 years of earnings happen to align with the longest period without a recession in US history so it's no surprise that metric is high. The current P/E ratio is 20.53 [0] and there have been many periods in which it has been higher.

[0]: https://www.multpl.com/s-p-500-pe-ratio

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Re:Have the record number of investors in the stock market l... by christophilus on Saturday May 16, 2020 @05:52PM (#23207523)

We still require a 25% drop in P/E to bring us back to the historical mean. There are reasonable arguments as to why we may never mean revert, why this time is different (possibly permanently low interest rates, stocks as a leading indicator of future inflation due to Fed printing inflating asset prices , etc). But as a rule, I like to bet on mean reversion, not against it.

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