Podcast: Your Friend or Foe?

On today's Planet Money:

Planet Money examines an age-old but confusing question: why do businesses selling the same thing crowd around each other rather than stake out a bit of space on their own? To help answer that, Adam Davidson and Chana Joffe-Walt take us on a stroll of New York City's diamond, plant and, yes, chess district. Be prepared for a surprising tale of why economics helps people keep their friends close and thier enemies closer.

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