Bargain-basement stock prices? Handle with care

By Kristina Cooke

NEW YORK (Reuters) - Every prospective investor has heard this line in the past month: The historic selloff in U.S. stocks has left them bargain-basement cheap.

But -- as your mother warned you about outrageous bargains -- if it looks too good to be true, that's because it is.

A key benchmark for measuring equity valuations -- the forward four-quarter price to earnings ratio for the S&P 500 -- currently stands at 9.8, according to Thomson Reuters data. Not only does that suggest stocks are roughly 35 percent less expensive than their historical average of 15 times forecast earnings, it makes them the cheapest since 1984.

Investors should be salivating over such a once-in-a-generation opportunity to get stocks at so deep a discount.

Here's the problem: Wall Street analysts and strategists have yet to get their arms around the deteriorating outlook for a year from now. Once they do, the current estimate for S&P 500 companies as a group to generate $91.15 per share profit over the next four quarters -- the highest ever forecast -- will almost certainly plummet and undermine the stocks-are-cheap thesis in the process.

"At this point we are very suspect of analysts' earnings estimates and stock prices in relation to them," said Cleveland Rueckert at Birinyi Associates Inc in Stamford, Connecticut.

Most analysts are barely keeping up with the deteriorating profit scene being reported now by U.S. companies for the just-completed third quarter, which is shaping up as the fifth straight quarter of declining earnings. In fact, current estimates suggest a big profit recovery starting in the fourth quarter, even as economists forecast another drop in quarterly gross domestic product.

That disconnection helps feed the investor doubt hanging around stocks.