On Monday, the iPath Series B S&P 500 VIX Short Term Futures ETN (NYSEArca: VXX) increased 5.3%, and the ProShares VIX Short-Term Futures ETF (NYSEArca: VIXY) advanced 5.6%. The CBOE Volatility Index and VIX-related exchange traded funds spiked Monday as U.S. equities retreated on slowing growth fears in the face of surging crude oil prices and rising inflationary pressures. "The market's on increasingly shaky ground," Hans Olsen, chief investment officer at Fiduciary Trust, told the Wall Street Journal.