The OECD lowered the U.S. growth outlook to 1.6% from 2.2%, a figure Kevin Hincks considers low. Reporting from the Cboe Global Markets, Kevin explains why he sees the markets grinding higher into the summer. He warns investors to watch for economic data that can shake up the course to all-time highs. Kevin also talks about why China needs a trade deal "a lot more" than the U.S.