Chetan Ahya, Morgan Stanley Chief Economist & Global Head of Economics, thinks trade tensions were the cause of China's slowdown. David Kostin, Goldman Sachs Chief U.S. Equity Strategist, expects modest earnings growth in 2019. Emma Ross-Thomas, Bloomberg Brexit Editor, brings us a Brexit update. Mike Spence, NYU Professor, says it's confusing what the U.S. and China really want.