It all started with a note by JPM’s Marko Kolanovic last Wednesday, in which he warned that the period of market calm is ending, and volatility was about to surge, which in a reflexive fashion would lead to accelerated selling by quant, systematic and risk-parity funds as a result of near-record leverage. According to Kolanovic while a driver of the recent market stability the “relatively stable macro data and a seasonal decline in trading activity” he explained that “