Fascinating.
Oddly, the Bizarro World of quant trading largely masked the losses to the outside world at first. Since the stocks they'd shorted were rising rapidly, leading to the appearance of gains on the broader market, that balanced out the diving stocks the quants had expected to rise. Monday, the Dow industrials actually gained 287 points. It gained 36 more points Tuesday, and another 154 points Wednesday.
As a "mom & pop" trader myself, I remember those three days, and the huge sell-off that followed on Thursday and Friday. Even more telling, the Fed was as clueless as many of us:
Authorities, meanwhile, had little idea about the massive losses taking place across Wall Street. That Tuesday afternoon, the Federal Reserve said it had decided to leave short-term interest rates alone at 5.25%.Investors on Main Street had little idea that a historic blowup was occurring on Wall Street. AQR risk-management guru Aaron Brown had to laugh watching commentators on CNBC discuss in bewilderment the strange moves stocks were making, with no idea about what was behind the volatility. Truth was, Mr. Brown realized, the quants themselves were still trying to figure it out.
It could happen again, there are no systems in place to prevent it, and the same motivations are driving the market makers to make huge leveraged moves.
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