The stock market isn’t particularly volatile. Still, it’s fragile. A spike and quick reversal in volatility gauges on fairly benign S&P 500 Index moves over the past two weeks has renewed discussion about market fragility, with long periods of calm being broken up by sudden oversized swings. Most Read from Bloomberg The latest example came on Oct. 16, when the Cboe Volatility Index surged to a six-month high as the S&P 500 dropped just 0.6% on concern about loan losses at regional banks. The VIX move r ...