On Thursday, the government declared that the economy grew rapidly in the third quarter, which means it's time to figure out who won. During the past several months, I've been identifying companies that thrived during the downturn, such as McDonald's and the guns-and-ammo manufacturer Freedom Group. (Click here to follow Daniel Gross)

Another group that seems to have had the right business model for a downturn is vitamin companies.

The market for initial public offerings offers indications of what sectors are hot. Since the onset of the recession, retail has been ice cold. According to Lynn Cowan of the Wall Street Journal, the last retailer to go public was Lumber Liquidators, nearly two years ago. (Stifle your "Timber!" jokes—the stock has done well.) But earlier this week, the retail shutout ended. The Vitamin Shoppe, a company that has grown from a single New York store in the 1970s to a 434-store chain today, filed for an initial public offering in July and raised about $150 million on Tuesday.

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