During the summer's market turmoil, many quant funds have posted double-digit losses but a big portion of those losses were quickly recovered, writes Barron's Michael Santoli. Still, there are questions regarding possible flaws in quant strategies. "The answer seems to be that while this rocky period highlighted some blind spots in quant strategies, it mostly resulted from over-crowding in a few small pockets of quant land and the hasty exit of less-seasoned players," Santoli writes. 

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