Financial markets are taking in a collective breath ahead of Jerome Powell's eighth and final keynote Jackson Hole speech as Federal Reserve Chair. If the moves following his last seven are any guide,

Fed chair Jerome Powell will deliver remarks at Jackson Hole on Friday. State Street's chief strategist lays out what investors should listen for.

Powell has never responded directly to Trump's provocations, and I, personally, expect this issue to play a predominant role at his latest meeting in Jackson Hole, perhaps even more so than the interest rate discussion. The independence of central banks is much more important than a 25 basis point change in the coming month.