Despite a wave of bailouts, few asset management firms pledge unequivocally to defend the $1 net asset value of their money market mutual funds, a survey by an industry newsletter found.

Only three of 22 asset managers contacted by Money Market Insight said would they definitely prop up their money market funds if the portfolios were on the brink of "breaking the buck." They were United Services Investment Management Co., United Services Advisors, and Charles Schwab & Co.

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