Fed Chair Jerome Powell used his much-anticipated speech from Jackson Hole on Friday to signal that the US central bank is on track for an interest-rate cut in September, after holding its benchmark steady in the first eight months of the year. The market reaction was instantaneous, with Powell unleashing the biggest cross-market surge since April by striking a surprisingly dovish tone during his speech. The S&P 500 Index rebounded from a five-day slide, rising +1.5%; meanwhile, the rate/economically-sensitive Russell 2000 small-cap index surged almost 4%.