Is the Bull Market Over

Is the Bull Market Over

Is the Bull Market Over ? ....

With today's low interest rates, it makes sense that price-earnings ratios should be higher than average.

My friend Robert Shiller recently accepted a well-deserved Nobel Memorial Prize in Economics for his work on understanding volatility in the financial markets. Shiller has also devised an indicator for determining whether the stock market is cheap or expensive called the CAPE ratio, short for cyclically adjusted price-earnings ratio.

In calculating the market’s P/E, the standard practice is to divide the price of Standard & Poor’s 500-stock index by either the previous 12 months’ earnings for the companies in the index or analysts’ estimates of earnings over the next 12 months. But the CAPE ratio substitutes the index’s average earnings over the preceding ten years. Shiller’s rationale: Using a long-term average of past earnings reduces the likelihood that the peaks and troughs of the business cycle will lead to the use of abnormally high or low earnings in calculating the P/E.

Over time, the CAPE ratio has proved to be an accurate predictor of stock returns. Forecasts generated by the CAPE ratio have generally been very similar to those resulting from standard P/E methodology. For example, in early 2000 at the top of the tech bubble, both ratios indicated that the stock market was overvalued.

But in recent years, predictions based on each of these two ratios have diverged. The CAPE ratio recently stood more than 50% above its long-term average and presented a bearish picture of future stock returns. Traditional P/E calculations using current and forecast earnings, however, showed that the market is trading close to its average historical valuation. Which is correct?

A record fall-off. My studies indicate one reason that the CAPE ratio appears to be so bearish. Reported earnings of the S&P 500 (used by Shiller to calculate the CAPE ratio) fell a record 92% in the 12 months ended in March 2009. In fact, in the fourth quarter of 2008, S&P 500 earnings were negative for the first time in the history of the index. This sharply reduced the ten-year average and set the CAPE ratio well above its historical level. It won’t be until 2020 that the earnings depression caused by the Great Recession is no longer reflected in the ten-year average, restoring the CAPE to more-normal levels.

A more significant explanation is that over the past two decades, the method of computing the S&P 500’s reported earnings series has changed dramatically. Firms are now required to write down assets that have lost value and include those losses in reported earnings, regardless of whether the asset was sold. But firms cannot “write up” appreciated assets unless they are sold. As a result, earnings declines in the 2001 recession, and particularly in the most recent downturn, were much more severe than in any previous economic contraction.

In contrast to the S&P earnings series, corporate profits as measured by the National Income and Product Accounts did not turn negative in the fourth quarter of 2008. Furthermore, the maximum decline in 12-month earnings was 22% instead of 92%. When NIPA profits are substituted for S&P reported earnings, the CAPE ratio is only about 10% to 15% above its long-term average—not statistically meaningful.

None of this should detract from CAPE’s attractiveness. But it’s important to use a data series that has been consistently generated over the years, such as the NIPA figures. Even when the data has been collected consistently, investors should be mindful that the correct P/E for the market is not necessarily its long-term average. For instance, with today’s low interest rates, it makes sense that P/Es should be higher than average. We believe the current bull market is not over, and any correction will prove to be a buying opportunity.

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