Down to the Last Drop of Profit Growth

STOCKS ARE ALLEGEDLY CHEAP NOW, at 17 times 2007 earnings. And they are cheap by historical standards. Only seven years ago, they were at price/earnings ratios double today’s; they are even cheaper if you compare their forward earnings yield of 6.7% to Treasuries’ yield of 4.25%. They are cheap, cheap, cheap! Or so we’ve been told.

Unfortunately, the cheapness argument falls on its face once we realize that pretax profit margins are hovering at an all-time high of 11.9%, almost 40% above their average of 8.5% since 1980. Once profit margins revert to their historical mean, the “E” in the P/E equation will decline. If the market made no price change in response, its P/E would rise from 17 to 23.8 times trailing earnings.

Many disagree that the profit-margin reversion will take place. Here are the most common arguments against it, and some food for thought on why “common” doesn’t necessarily translate as “wise.”

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