Having spent a large proportion of my career prior to joining GMO working at investment banks, I’m well aware of what Andrew Smithers describes as “Stock Broker Economics,” the second tenet of which is “The market is always cheap.”1 Over the years I’ve witnessed many attempts by the practitioners of this most dark art to justify why tried and tested measures of valuation are no longer meaningful, or occasionally create new measures of valuation that purport to show the market to be cheap.

A recent outbreak of precisely this brand of sorcery has surrounded the Shiller P/E (price relative to 10-year moving average earnings adjusted for inflation as shown in Exhibit 1). Wizards range from the seemingly ever optimistic Jeremy Siegel to any number of Wall Street strategists, and even a blogger whose work I generally enjoy.3 Given that one should always look for evidence that may prove one wrong, I’ve spent some time thinking about the issues they have raised and have summarized my thoughts in this short paper.

Shiller PE CAPE

One of the criticisms of Shiller’s Cyclically Adjusted P/E (CAPE) that I’ve come across is that it hasn’t given a cheap signal in a long time; that is to say that it has not mean reverted of late.

I am, however, less than convinced by this argument. There is nothing contradictory between the predictions based on the Shiller P/E and the returns that we have witnessed. Exhibit 2 shows the simplest way that I can imagine of transforming the Shiller P/E into a forecast return. We simply revert the P/E towards average over the course of the next seven years and then add a constant to reflect growth and income (let’s call it 6% for simplicity’s sake). It does a pretty reasonable job of capturing realised returns. If anything, it tends to overpredict returns, rather than underpredict them (which is another of the charges levelled by the critics).

Shiller PE predicted returns CAPE

I’d actually suggest that the Shiller P/E is quite possibly too optimistic currently (the complete opposite of the critics’ claim). This is because 10-year earnings are currently high relative to their trend. Exhibit 3 shows real earnings, their 10-year average, and a trend line fitted through the 10-year average. Real earnings are currently massively above their 10-year average (accounting for the difference between the spot P/E and the Shiller P/E). However, 10-year average earnings are also significantly above their trend, suggesting that earnings have been above average for a prolonged period (more on this a little later).

Real earnings CAPE

If one were to use 10-year trend earnings rather than current trailing 10-year earnings, the P/E would rise from 25x shown on the Shiller measure to 34x (see Exhibit 4). This trend measure actually has a better relationship with realised returns than the straight Shiller P/E. That is to say that some of the overprediction of the Shiller P/E has been caused by 10-year average earnings being inflated.

Shiller Full Reversion CAPE

Another current criticism of the Shiller P/E is that the impact of goodwill impairment accounting (FASB 142) has led to a situation in which earnings are much more volatile than has been the case historically, thus invalidating the earnings series that underpins the calculation.

To some extent this criticism is already rebutted by the analysis above: 10-year average earnings are significantly above their trend. This is not suggestive of a situation whereby average earnings are being dragged down by the very low numbers recorded during the Global Financial Crisis. Much as it is tempting for those of a bullish nature to focus on the extent of the drawdown in earnings in 2008, they happily ignore the peak levels of earnings seen before the crisis, or indeed the rapid recovery in earnings (helped as it was by the suspension of FASB 157 on financials’ mark-to-market assets). This is why we average – it smooths out the highs and lows.

Before we head into some proposed solutions to the problems raised, I’d like to take a quick detour into some work that my colleague Simon Harris has been doing on understanding earnings and balance sheets. In the course of that work Simon examined the role of goodwill impairment in the collapse in earnings seen during the Global Financial Crisis. Exhibit 5 shows a summary of his findings with respect to the U.S. Look at the grey area, which represents the sum of earnings before any goodwill or other intangibles are written down or amortised (for our U.S. universe).

They collapsed by about 60%. Ergo, much of the earnings collapse had nothing to do with FASB 142! However, let us put this to one side for now, and instead consider one of the proposed “solutions”: to replace the GAAP reported earnings series with National Income Product Accounts (NIPA) profits. This strikes me as an odd move on many levels, not least of which is the fact that NIPA covers about 9000 companies of just about every shape and size compared with the narrowly focused 500 names within the S&P.

As I have discussed before,4 NIPA profits are at record highs, and have been significantly elevated for a prolonged period. As such, using NIPA earnings embeds a very high profit margin assumption into the valuation framework. Over the last 10 years profit margins from NIPA have averaged 8% of GNP, compared to the long-term average of
6% (see Exhibit 6).

US earnings CAPE

As regular readers know, we favour the Kalecki profits equation for thinking about the sources of the very high profits margins. This equation says that profits are the result of net investment plus dividends minus savings (carriedout by some combination of the household, government, and foreign sectors).

Exhibit 7 shows the breakdown of profits into various components. As we have written before, in the wake of the Global Financial Crisis net investment collapsed and has only recovered very slowly. The key reason profits have held up is because of fiscal deficits run by the government. Given that the deficit is “forecast” by such august bodies as the Congressional Budget Office to decline significantly over the next few years, it will take either a remarkable recovery in investment spending or a significant re-leveraging by the household sector to hold margins at the levels we have witnessed of late.5 Thus, embedding such high margins in a valuation seems optimistic to me.

I suspect that the rationale for suggesting replacing GAAP as reported earnings with NIPA earnings is that NIPA earnings track profits from current production and as such ignore capital gains and losses from M&A activity and write-downs from bad debts (they look more like so-called “operating earnings”). Let me put aside my concerns about the validity of using NIPA as the basis of a valuation approach and instead look at what doing so shows.6

Kalecki decomposition CAPE

Exhibit 8 represents an attempt to reproduce

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