Only 3 percent of Haitians own their own car, so if someone is traveling more than walking distance, they often ride cheap, wildly decorated busses known as "tap-taps." Here Planet Money's Adam Davidson explores the artistry -- and economic theory -- behind Haitians' preferred mode of transportation. (Produced by Travis Fox.)

This report is part of a special series on Haiti produced in partnership with NPR's Planet Money. You can listen to a radio version of this story online at npr.org.