As interest rates have declined to their lowest level in 45 years and individual investors pull cash from money market mutual funds, municipalities and other institutional investors have been moving money into the funds, the Wall Street Journal reports.

Assets in institutional money funds have grown to $1.2 trillion, a 28% increase since April 2001. Meanwhile, assets for individual investors in the funds declined 12% since that time. Individual investors have pulled cash out of the money market mutual funds looking to invest in products with better returns.

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