The term altcoin has various similar definitions. Stephanie Yang of The Wall Street Journal defined altcoins as "alternative digital currencies," while Paul Vigna, also of The Wall Street Journal, described altcoins as alternative versions of bitcoin. Aaron Hankins of the MarketWatch refers to any cryptocurrencies other than bitcoin as altcoins.
Money market funds seek to limit exposure to losses due to credit, market, and liquidity risks. Money market funds in the United States are regulated by the Securities and Exchange Commission (SEC) under the Investment Company Act of 1940. Rule 2a-7 of the act restricts the quality, maturity and diversity of investments by money market funds. Under this act, a money fund mainly buys the highest rated debt, which matures in under 13 months. The portfolio must maintain a weighted average maturity (WAM) of 60 days or less and not invest more than 5% in any one issuer, except for government securities and repurchase agreements.
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.
As a cryptocurrency attracts more interest, mining becomes harder and the amount of coins received as a reward decreases. For example, when Bitcoin was first created, the reward for successful mining was 50 BTC. Now, the reward stands at 12.5 Bitcoins. This happened because the Bitcoin network is designed so that there can only be a total of 21 mln coins in circulation.