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Fifty years ago, the Manhattan Project of money management was quietly assembled in the financial industry's backwaters, unified by the heretical idea that even many of the world's finest investors couldn't beat the market in the long run. The motley crew of nerds - including economist wunderkind Gene Fama, humiliated industry executive Jack Bogle, bull-headed and computer-obsessive John McQuown, and avuncular former WWII submariner Nate Most - succeeded beyond their wildest dreams. Passive investing now accounts for more than $20 trillion, equal to the entire gross domestic product of the US, and is today a force reshaping markets, finance and even capitalism itself in myriad subtle but pivotal ways. Yet even some fans of index funds and ETFs are growing perturbed that their swelling heft is destabilizing markets, wrecking the investment industry and leading to an unwelcome concentration of power in fewer and fewer hands.