Business Insider senior editor Josh Barro sits down with Paul Krugman, a Nobel Prize-winning economist and distinguished professor of economics at the Graduate Center of the City University of New York. Krugman doesn't attribute the recent run up in stocks to the GOP tax bill. He notes that stocks are up about the same amount all around the world, which is certainly not specific to Trump. In terms of the economy, he doesn't think Trump deserves credit for how strong it is, considering no actual policies have been put into place. He also mentions that the economy has been adding jobs at a steady rate for years now.