The SEC reports that the popularity of and investments in money market funds has grown significantly and they currently hold about US$3 trillion in assets. They have become one of the core pillars of the present-day capital markets as they offer investors a diversified, professionally managed portfolio with high daily liquidity. Many investors use money market funds as a place to "park their cash" until they decide on other investments, or for funding needs that may arise in the short term. Transactions that occur through the use and exchange of these altcoins are independent from formal banking systems, and therefore can make tax evasion simpler for individuals. Since charting taxable income is based upon what a recipient reports to the revenue service, it becomes extremely difficult to account for transactions made using existing cryptocurrencies, a mode of exchange that is complex and difficult to track.