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Now Playing: 01-23-12 Marketplace Morning Report

Republican presidential candidate Mitt Romney has taken criticism for his time at the private equity firm Bain Capital. But what is private equity, and does it really help the economy? On this Chinese New Year, Chinatowns across the U.S. are shifting from urban to suburban centers. Plus, we tell you why it's a bittersweet moment for the cocoa market. And is solar in trouble?