Aon and Willis have been able to reduce their dependency on bonus commissions, according to a report by Standard & Poor's (S&P).

The rating agency indicated in its report that Aon and Willis have "weaned themselves" off contingent commissions by cutting expenses and raising commissions.

S&P analysts said the fate of Marsh was far harder to predict since they believed "that the stigma of the bid-rigging accusations drove clients away from the company to seek their insurance placements elsewhere."

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