Traders work on the floor of the New York Stock Exchange. US equities have defied virtually every warning in the past five months, clocking one of the best stretches since the 1950s even as investors fretted over the strength of the economy and the impact of tariffs. Most Read from Bloomberg While the third quarter is ending with the S&P 500 Index on track for another advance, the mood seemed to shift, however slightly, at the end of last week. The equity benchmark fell three straight days — hardly alarm ...