Price to earnings

There are several stocks out there that seem expensive, but only in the rearview mirror -- especially shares of fast-growing tech firms, or companies that do great business overseas. Read on to find out how to spot a stock worth buying.

Math: the four-letter word you can say on TV yet so reviled that people go great lengths to avoid it, even when they know doing so puts their financial well-being in peril. Wait! Don't click away. Today brings part two in a continuing series that spotlights the major computations found here at DailyFinance. This time, it's all about the P/E ratio.

Great news, everyone. Even the ever-bearish David Rosenberg, chief economist and strategist at Gluskin Sheff (and formerly of Merrill Lynch) is calling for a "V" shaped recovery. Unfortunately, he's not talking about the kind of "V" everyone wants: a snap back as equally sharp as the decline....