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The FT Alphaville blog has a post, The US stock market is overvalued by 40%, based on a recent research report, The US Stock Market: Value and Nonsense About It, from Andrew Smithers of London-based research house Smithers & Co.

According to the FT Alphaville blog, Smithers says there are only two ‘valid’ ways to value the market. One is by using a cyclically adjusted PE ratio and the other by using the Q ratio, which compares the market capitalisation of companies with their net worth, adjusted to current prices. Both techniques yield the same answer: the stockmarket is overvalued by around 40%.

Smithers explains:

As the valid measures of the US market show that it is currently around 40% overvalued, some ingenuity is needed to claim otherwise. The EPS for the past 12 months on the S&P 500 is $7.51 so, with the index at 1071, it is selling at a trailing PE of 142. This is far higher than it has ever been before, as the previous end month record is a PE of 47. But current multiples are no guide to value; when depressed, or elevated, they need to be adjusted to their cyclical norm.

This is how the cyclically adjusted PE (”CAPE”) is calculated and when its current value is compared with long-term average, using the geometric means of EPS and cyclically adjusted PEs,6 it shows that the market is 37.7% overpriced using 10 years of earnings’ data and 45% if 20 years are used. This method is therefore of no use to those who sell shares, or have made faulty claims about value in the past. The following are among the most common approaches to circumventing the problem this presents. Some produce relatively small distortions, but these can amount to a substantial degree of misinformation when combined.

Go to the The FT Alphaville blog post, The US stock market is overvalued by 40%.