A routine I performed at the American Economic Association humor session in Atlanta; it includes jokes about artificial intelligence, robots taking our jobs, Angus Maddison, Baumol’s cost disease, and a new knock-knock joke! If you want to download a version to show in classes or elsewhere—or if YouTube is blocked in your country—right-click here and choose “save as” to download a 50 meg MP4 file to your computer. (To play it, PC users might need a free download of this QuickTime player.)