U.S. President Donald Trump and China's President Xi Jinping shake hands before their bilateral meeting during the G-20 leaders summit in Osaka, Japan on June 29, 2019.The mere prospect of a U.S.-China trade deal is enough to send markets higher.On Monday stateside, the S&P 500, Dow Jones Industrial Average and Nasdaq Composite closed at record highs — with the broader market index breaking past the 6,800 level for the first time.And that's before an agreement has been signed officially."A lot of the foreca ...