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Now Playing: 12-26-12 Marketplace

Jeremy Hobson goes to the gun buyback event in downtown L.A. to talk to Mayor Villaraigosa about how to keep firearms off L.A.’s streets. Meanwhile, Stephen Beard reports on what gun control looks like in Europe. The housing market in the U.S. continues to rise, but one state -- Michigan -- has missed out on home price gains. We take a look at the private transportation system in Silicon Valley. Dan Bobkoff explores what happens when competitive companies -- like Netflix and Amazon -- have to depend on each other. And Freakonomics Radio's Stephen Dubner talks about the best way to motivate your employees to be more productive.