After more than two and a half years of aggressive monetary tightening, U.S. Federal Reserve Chairman Jerome Powell is widely expected to indicate an impending shift towards easing monetary policy. What Happened: Powell’s highly anticipated keynote address at the Kansas City Fed’s Jackson Hole Economic Symposium is scheduled for Friday at 10 a.m. ET, and this event has historically been used by Fed chairs, including Powell, to signal significant changes in central bank policy, Coindesk reported. Market participants have been preparing for this shift for some time, with traders already pricing …