问题：

What is the Money Market Mutual Funds

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答案：

The money markets are wholesale markets where most securities trade in large denominations. This characteristic effectively blocks most individuals from investing directly in these securities. However, the markets usually find a way to correct for such deficiencies, especially when potential customers are available. Money market mutual funds represent one such correction. 　　Money market mutual funds (MMMFs) are funds that aggregate money from a group of small investors and invest it in money market. They have grown enormously popular since their inception in the early AIG0s because they provide a means for small investors to take advantage of the returns offered on money market securities. These securities would be out of reach to most small investors because of their large minimum denominations.