Edit this Published in Freakonomics Radio Where Have All the Hitchhikers Gone? Listen Queue Download this audio Want to embed this player? Use the code below. More info. <iframe frameborder="0" scrolling="no" height="130" width="100%" src="https://www.wnyc.org/widgets/ondemand_player/wnyc/#file=/audio/json/164255/&share=1"></iframe> Share on Facebook Share on Twitter Email a Friend Did we needlessly scare ourselves into ditching a good thing? And, with millions of cars driving around with no passengers, should we be rooting for a renaissance?