A giant money market fund, Reserve Primary Fund, had broken the buck a day earlier (which meant that the value of the fund’s assets had fallen to below a dollar per share—in this case, 97 cents). Money market funds were never supposed to do that; they were one of the least risky investments available, providing investors with minuscule returns in exchange for total security. But the Reserve Primary Fund had chased a higher yield—a 4.04 percent annual return, the highest in the industry—by making risky bets, including $785 million in Lehman paper. Investors had started liquidating their
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