Investors seeking safety and stability have recently been moving massive amounts of their assets into money market mutual funds, causing the funds to swell to nearly $4 trillion and making them the single largest mutual fund asset class, according to the Investment Company Institute.

Despite their growing popularity, there are many problems with these funds that need to be resolved. A new report by the ICI's Money Market Working Group, released Tuesday, addresses these concerns and offers recommendations that will improve transparency, stability and investor confidence.

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