Edit this Published in Freakonomics Radio The Cobra Effect Listen 34 min 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/242728/&share=1"></iframe> Share on Facebook Share on Twitter Email a Friend When you want to get rid of a nasty pest, one obvious solution comes to mind: just offer a cash reward. But be careful -- because nothing backfires quite like a bounty.