NPR Planet Money Podcast: "Episode 629: Buy Low, Sell Prime: Sam Cohen buys stuff at big retail stores, then turns around and sells it on Amazon for a quick profit. It defies economic logic. But somehow, there's a whole multimillion-dollar industry doing this. Today on the show: We meet the modern middleman and we find out how he makes money doing something that should be economically impossible.

NPR Planet Money Podcast: "Episode 629: Buy Low, Sell Prime: Sam Cohen buys stuff at big retail stores, then turns around and sells it on Amazon for a quick profit. It defies economic logic. But somehow, there's a whole multimillion-dollar industry doing this. Today on the show: We meet the modern middleman and we find out how he makes money doing something that should be economically impossible.