RT @markmobility: Billionaire @MichaelDell on @AOC's 70% marginal tax rate on millionaires: "Name a country where that's worked -- ever." Co-panelist and MIT professor Erik Brynjolfsson: "The United States!" #Davos2019 https://t.co/fVgrFI73wO

http://twitter.com/shaunking/status/1088373886826307585