"MAKE.MONEY.FAST" is a title of an electronically forwarded chain letter which became so infamous that the term is now used to describe all sorts of chain letters forwarded over the Internet, by e-mail spam or Usenet newsgroups. In anti-spammer slang, the name is often abbreviated "MMF".
In the past, money was generally considered to have the following four main functions, which are summed up in a rhyme found in older economics textbooks: "Money is a matter of functions four, a medium, a measure, a standard, a store." That is, money functions as a medium of exchange, a unit of account, a standard of deferred payment, and a store of value.^[4] However, most modern textbooks now list only three functions, that of medium of exchange, unit of account, and store of value, not considering a standard of deferred payment as a distinguished function, but rather subsuming it in the others.^[3]^[19]^[20]

There have been many historical disputes regarding the combination of money's functions, some arguing that they need more separation and that a single unit is insufficient to deal with them all. One of these arguments is that the role of money as a medium of exchange is in conflict with its role as a store of value: its role as a store of value requires holding it without spending, whereas its role as a medium of exchange requires it to circulate.^[4] Others argue that storing of value is just deferral of the exchange, but does not diminish the fact that money is a medium of exchange that can be transported both across space and time.^[21] The term 'financial capital' is a more general and inclusive term for all liquid instruments, whether or not they are a uniformly recognized tender