The money market consists of financial institutions and dealers in money or credit who wish to either borrow or lend. Participants borrow and lend for short periods, typically up to twelve months. Money market trades in short-term financial instruments commonly called "paper". This contrasts with the capital market for longer-term funding, which is supplied by bonds and equity.
If this sounds similar to banks’ high-yield savings accounts or money market accounts, it is. The largest difference lies in the ability for yields on money market mutual funds to rise proportionately with interest rates. For example, as interest rates have risen, the yields on most bank money market accounts (which are set by the banks themselves) have stayed relatively flat, while money market mutual fund yields have increased.
To many retail investors, money market funds are confusingly similar to traditional bank demand deposits. Virtually all large money market funds offer check writing, ACH transfers, wiring of funds, associated debit and credit cards, detailed monthly statements of all cash transactions, copies of canceled checks, etc. This makes it appear that cash is actually in the individual’s account. With net asset values reported flat at $1.00, despite the market value variance of the actual underlying assets, an impression of rock solid stability is maintained. To help maintain this impression, money market fund managers frequently forgo being reimbursed legitimate fund expenses, or cut their management fee, on an ad hoc and informal basis, to maintain that solid appearance of stability.
NEM — Unlike most other cryptocurrencies that utilize a Proof of Work algorithm, it uses Proof of Importance, which requires users to already possess certain amounts of coins in order to be able to get new ones. It encourages users to spend their funds and tracks the transactions to determine how important a particular user is to the overall NEM network.
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.