resulted in a "buyers strike", as money funds could not (because of redemptions) or would not (because of fear of redemptions) buy commercial paper, driving yields up dramatically: from around 2% the previous week to 8%, and funds put their money in Treasuries, driving their yields close to 0%. This is a bank run in the sense that there is a mismatch in maturities, and thus a money fund is a "virtual bank": the assets of money funds, while short term, nonetheless typically have maturities of several months, while investors can request redemption at any time, without waiting for obligations to come due. Thus if there is a sudden demand for redemptions, the assets may be liquidated in a fire sale, depressing their sale price. An earlier crisis occurred in 2007–2008, where the demand for asset-backed commercial paper dropped, causing the collapse of some structured investment vehicles. As a result of the events, the Reserve Fund liquidated, paying shareholders 99.1 cents per share. Statistics The Investment Company Institute reports statistics on money funds weekly as part of its mutual fund statistics, as part of its industry statistics, including total assets and net flows, both for institutional and retail funds. It also provides annual reports in the ICI Fact Book. At the end of 2011, there were 632 money market funds in operation, with total assets of nearly US$2.7 trillion. Of this $2.7 trillion, retail money market funds had $940 billion in Assets Under Management (AUM). Institutional funds had $1.75 trillion under management. Types and size of money funds In the United States, the fund industry and its largest trade organization, the Investment Company Institute, generally categorize money funds into the type of investment strategy: Prime, Treasury or Tax-exempt as well as distribution channel/investor: Institutional or Retail. Prime money fund A fund that invests generally in variable-rate debt and commercial paper of corporations and securities of the US government and agencies. Can be considered of any money fund that is not a Treasury or Tax-exempt fund. Government and Treasury money funds A Government money fund (as of the SEC's July 24, 2014 rule release) is one that invests at least 99.5% of its total assets in cash, government securities, and/or repurchase agreements that are "collateralized fully" (i.e., collateralized by cash or government securities). A Treasury fund is a type of government money fund that invests in US Treasury Bills, Bonds and