Now Playing: 07-10-12 Marketplace

In the latest installment of Freakonomics Radio, Steven Levitt explains how bribes might actually get kids to do better in school. Neiman Marcus and Target are collaborating on a new collection. An upcoming court case may change whether you have to pay the fee to swipe your card for a purchase. An American tourist company in Paris is offering guided tours through historical places for African Americans. Commentator Justin Wolfers explains the competing narratives in this year's election. And we look at the tiny news stories that are packing a big punch.