Robert Smith

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Most people go to the fair to ride the Tilt-A-Whirl or eat funnel cakes, but not our Planet Money team. Robert Smith and Kenny Malone traveled to the Ohio State Fair to learn the secret art of selling people things they might not need.

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Over the last few days, we've been watching our Planet Money team as they bought crude oil from a man in Kansas.

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JASON BRUNS: It's not heavy crude. It's the sweet crude, what people want

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