U.S. Federal Reserve Chairman Jerome Powell gave a speech in Rhode Island yesterday and, afterwards, was asked whether the Fed was keeping an eye on the markets. His reply contained six words that investors didn't want to hear: "Equity prices are fairly highly valued." The S&P 500 lost 0.55% on the day. Markets in the U.K. and Europe are all down this morning. The picture is mixed: Asia largely had a good day and U.S. futures are marginally up, so it's not a tsunami.