Usually it is the fund wholesaler who finds himself politely escorted out of an investment advisers' office with nothing but a sales pitch to show for his time. But Dimensional Fund Advisors, with approximately $31 billion in assets under management, has managed to turn that situation around.

Excluding market timers, most fund complexes are not too choosy about who pushes their funds, but not Santa Monica, Calif.-based Dimensional. The asset management firm is not only picky about who represents its products, but insists that the advisers who sell them abide by some hard and fast rules.

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