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Now Playing: 08-10-12 Marketplace Mid-day Update

The Agriculture Department gives us new estimates for this fall's harvest today and the expectation is: it won't be pretty. Corn is America's biggest crop, though some experts are questioning whether that should still be the case. There's a debate over whether -- and to what extent -- Congress should step in to help. And if you think about things we're not going to be using in the years ahead, small change like pennies might be one of them; so might DVDs. But if you look at the success if the company Coinstar, which owns the DVD rental kiosk company Redbox, you might come to a different conclusion. Both businesses use machines to sell their products, rather than human employees.