On today's Planet Money: The economics of the Middle Ages.
Knights are extortionists. Guilds knock down your house if you don't play by their rules. And you have to wait until the black death kills a third of Europe before anything changes.
Download the podcast, or subscribe. Music: Lee Fields & The Expressions' "Money I$ King." Find us:Twitter/ Facebook. Today's show is based on an interview that originally aired in a Planet Money podcast in 2009.