Friday is the day Fed chair Jerome Powell speaks at Jackson Hole. Kevin Hincks talks about the scenarios that can ignite a sell-off or lead to a rally. As he explains, it comes down to how he presents the latest round of inflation and jobs data. As for Nvidia (NVDA), Kevin looks into reports saying the A.I. giant ordered to halt production of its H20 chips. It comes as the company readies a new design for China.