Wall Street whiplash schools traders on fragile modern markets

Wall Street’s rapid descent into volatility has been matched by an equally swift recovery. The S&P 500 saw its largest weekly gain since November, junk bonds made a week of gains, and Treasury yields stabilized. Illustrating this dramatic turnaround, the VIX Index, a key measure of market fear, experienced both the quickest surge of 25 points or more and the fastest recovery from that peak, according to UBS Group AG.