One interesting way to look at the attractiveness of investing in the stock market is to compare market valuation and earnings to historical peaks and valleys. Obviously, we want to buy when the market is cheap and sell when it is dear, but how do we measure it? There are a variety of ways to do this. One of the easiest is to compare stock prices to earnings.
The Shiller P/E was developed by Robert Shiller, a nobel prize winning economist. He postulated that looking at Price-to-Earnings (P/E) ratios over 10-year periods would be more informative that looking at 1-year forward or 1-year trailing earnings reports as many Wall Street analysts do. This method for measuring the market valuation of a stock or benchmark is called a "multiple" (ie a price multiple of earnings: 10x, 20x or 30-times earnings. A stock priced at $25 with $2.50 of earnings would have a P/E of 10.)
Another important factor to consider is whether corporate earnings are at a cyclical high or a cyclical low. Ideally, applying a trough P/E multiple to trough earnings is an excellent time to put money to work in stocks. Selling or trimming exposure when P/Es are high and earnings are at a cyclical high is also desireable.
Jeremy Grantham, an expert on market bubbles, explains today's situation:
Today the market is in the top percentile Shiller P/E of all time, and when you start from this level, you have a very hard time going up materially. You’ve done it once or twice, but you’ve only done it for a while: in the last gasp of 1929; in the last gasp of 1999; and notably and most impressively in Japan, where maybe for two and a half years you kept going. And in each case, they ended incredibly badly. So, the price you paid for bucking that kind of law was a very high price.
In general, if you want to make a lot of money, and you want to have a long bull market, you need high unemployment, depressed profit margins, and depressed P/Es. It’s a beautiful double counting created by multiplying depressed earnings by a low P/E. Multiplying peak earnings by a high P/E, which is what we’re doing today, is also double jeopardy the other way. And the gap between peak P/E times peak profits all the way to trough P/E times trough profits, that’s a big gap. That’s the kind of thing we saw in 1974 and 1982, and to some extent 2009. Yes, it was somewhat higher in 2009 than 1982, but the discount rate, interest rate, everything else had shifted, and it was down an awful lot from its peak.
But it feels good at the top of the spike; it always feels terrific. And people always torture the logic to think, like in 1929, that it’s a “new high plateau.” 1929 – in the most predictive model that I have come across, which is run by Hussman – the only year that is about the same is 2021 (for overvaluation), and a little bit higher, both of them, than today. These are not good times to start a 10-year bull market, and yet, one or two bulls are saying whoopee, this is the beginning of a great bull market.
We have totally full employment, totally wonderful profit margins. All the things you would not want to start a bull market from. This is where you start bear markets from. Great bull markets start with exactly the opposite. But it always feels wonderful. Peak profit margins, getting there takes years, and it feels nice. And so you’ve got a great track record. You can’t get to peak margins without leaving a terrific track record. You’ve got the peak P/E, so you feel wonderful, the stock market has gone up and up and up and up. So everyone feels great, and that’s how you get to a market peak. You feel great about everything. Of course, almost by definition.
When do you start going down? You still feel great. You just don’t feel quite as great as you felt the day before. That’s why it’s so damn hard, at both ends.
Jeremy Grantham, GMO, The Insightful Investor, March 19, 2024
Grantham is using the Double Jeopardy! concept from the gameshow, not the legal theory. On the game show, once the contestant made it to Double Jeopardy! the rewards and risks all doubled. So, in this context when earnings and multiples are high, the risk is the highest with two factors that can both go down. Conversely, when earnings and multiples are both down, the potential reward is the highest, with two factors that can both go up. Thus the concept of Double Counting where there is upside from both valuation and earnings appreciation.
Let's try to quantify some of these important concepts using the peak and trough P/E multiples from the last few cycles.
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