Baiju Bhatt, co-founder and co-CEO of Robinhood, discusses his commission-free investment app geared toward millennials. Shing Tao, chairman and CEO of Remark Holdings, talks about using their AI platform to scrape social media consumer data. Wayne Winegarden, an economics scholar and senior fellow at the San Francisco-based Pacific Research Institute, tells Pimm Fox and Lisa Abramowicz why the GOP tax bill should include payroll tax reform. Finally, Bloomberg's Katya Kazakina talks about how billionaires were stunned as Da Vinci's Christ painting sold for a record $450 million.