The U.S. government issues Treasury bills in the money market, with maturities that range from a few days to one year. Primary dealers buy them in large amounts directly from the government to trade between themselves or to sell to individual investors. Individual investors can buy them directly from the government through its TreasuryDirect website or through a bank or a broker. State, county, and municipal governments also issue short-term notes.
Perks: One of the biggest perks you'll find with TIAA Bank is its "Yield Pledge," which maintains that its yield pledge money market account rate will always be competitive and in the top 5 percent. Its money market account also has no monthly fee, allows for mobile check deposits and is IRA-eligible. As long as you keep at least $5,000 in your yield pledge money market account, TIAA Bank will reimburse all ATM fees charged by other banks. Regardless of your balance, you’ll be reimbursed up to $15 for ATM fees incurred by using non-TIAA Bank ATMs.
Over time, money market fund "depositors" felt more and more secure, and not really at risk. Likewise, on the other end, corporations saw the attractive interest rates and incredibly easy ability to constantly roll over short term commercial paper. Using rollovers they then funded longer and longer term obligations via the money markets. This expands credit. It’s also over time clearly long-term borrowing on one end, funded by an on-demand depositor on the other, with some substantial obfuscation as to what is ultimately going on in between.