Money market fund assets declined this week, likely due to corporate tax payments, after rising last week says ICI in its latest weekly "Money Market Mutual Fund Assets" report. The release says, "Total money market fund assets decreased by $19.18 billion to $2.67 trillion for the week ended Wednesday, March 18, the Investment Company Institute reported today. Among taxable money market funds, Treasury funds (including agency and repo) increased by $1.58 billion and prime funds decreased by $20.66 billion. Tax-exempt money market funds decreased by $100 million. Assets of retail money market funds increased by $1.29 billion to $892.38 billion. Among retail funds, Treasury money market fund assets increased by $290 million to $194.52 billion, prime money market fund assets increased by $680 million to $508.24 billion, and tax-exempt fund assets increased by $330 million to $189.61 billion. Assets of institutional money market funds decreased by $20.47 billion to $1.78 trillion. Among institutional funds, Treasury money market fund assets increased by $1.29 billion to $782.41 billion, prime money market fund assets decreased by $21.34 billion to $925.22 billion, and tax-exempt fund assets decreased by $420 million to $71.85 billion." Money fund assets fell for the first 5 weeks of 2015, then they've alternated between increases and decreases the past 6 weeks. Year-to-date, money fund assets have declined by $61 billion, or 2.2%.