Seen here:
According to the Investment Company Institute, more than 50 million Americans keep at least some of their assets in money market funds. As of March 2011, in fact, some $2.7 trillion was held in money markets—about 25% of all mutual fund assets in the United States. Equally compelling is the fact that in the 40-year history of money market funds, only two funds have seen their net asset values dip below $1 per share (often called "breaking the buck"). During that same period, in contrast, some 2,800 U.S. banks have failed, according to the Federal Deposit Insurance Corporation.
