I am no economist, so I find the concepts of M1, M2 ... M4 a little tough to understand. However, based on my own thoughts, I have come up with a new kind of money supply classification - that of fast money and slow money (which overlap but are the same as private and public money). Slow Money can be defined as money kept in form of long term reserves and used for projects with long gestation periods having assured but low rate of return. Typically, this is money kept in Fixed Deposits, Savings Bonds or other forms of Government borrowings. Such money is often used by the Government or its agents to build infrastructure or institutional framework for the country. Fast money is typically investor money - invested in ventures with potentially high returns but as much higher risk and with short to medium term return cycle. Such money - as is obvious from its definition - is typically invested in equity or other risky assets like venture capital funds, usually used for ventures whose sust