Money supply
Main article: Money supply
The money supply is the amount of money available within a specific economy available for purchasing goods or services. The supply is usually considered as four escalating categories M0, M1, M2 and M3. The categories grow in size with M3 representing all forms of money (including credit) and M0 being just base money (coins, bills, and central bank deposits). M0 is also money that can satisfy private banks' reserve requirements. In the United States, the Federal Reserve is responsible for controlling the money supply (monetary policy).
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Growing the money supply
Historically money was a metal (gold, silver, etc,) or other object that was difficult to duplicate, but easy to transport and divide. Later it consisted of paper notes, now issued by all modern governments. With the rise of modern industrial capitalism it has gone through several phases including but not limited to:
1. Bank notes - paper issued by banks as an interest-bearing loan. (These were common in the 19th century but not seen anymore.)
2. Paper notes, coins with varying amounts of precious metal (usually called legal tender) issued by various governments. There is also a near-money in the form of interest bearing bonds issued by governments with solid credit ratings.
3. Bank credit through the creation of chequable deposits in the granting of various loans to business, government and individuals. (It is critical that we understand that when a bank makes a loan, that is new money and when a loan is paid off that money is destroyed. Only the interest paid on it remains.)
Thus, all debt denominated in dollars -- mortgages, money markets, credit card debt, travelers cheques -- is money. However, the creation of dollar-denominated debt (or any generic obligation) only creates money when a bank (as opposed to a credit card company) is granting the debt. "High powered" money (M0) is created when the elected government spends money into the economy. The money created in the bank loan process is bank money and these two forms of money trade at par one with the other. Banks are limited in the amount of loans they can grant and thus in the amount of bank money (credit) they can create by both the net assets of the bank and by reserve requirements (M0). For most intents and purposes the aggregate of M0 multiplied by the reserve requirement will be an indicator of (but this is somewhat greater than) the aggregate of loans. If additional money is needed in the banking system to allow more loans the Federal Reserve will create money by purchasing Bonds or T-bills with money created from the other. No matter who sells the bonds the money will end up in the banking system as M0. The Fed could purchase lolly pops if that would accomplish the purpose of expansion better than a purchase of Bonds.