A desire for profits in a turbulent time for the market helped push mutual fund managers enough that they started allowing frequent market timing by clients, New York Times columnist Gretchen Morgenson writes.

Although some market timing was allowed in the early 1990s, it was usually in small doses and usually by a few institutional firms. But the end of market nirvana in 2000 touched off a huge jump in the practice, with hedge funds taking advantage most often.

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