Podcast:Freakonomics Radio Published On: Thu Nov 19 2020 Description: Companies around the world spend more than half-a-trillion dollars each year on ads. The ad industry swears by its efficacy — but a massive new study tells a different story. Hosted by Simplecast, an AdsWizz company. See pcm.adswizz.com for information about our collection and use of personal data for advertising.