Money:
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Money supply
Main article:
Money supply
In economics, money is a broad term that refers to any
financial instrument that can fulfill the functions of money (detailed above). These financial instruments together are collectively referred to as the
money supply of an economy. Since the money supply consists of various financial instruments (usually currency, demand deposits and various other types of deposits), the amount of money in an economy is measured by adding together these financial instruments creating a
monetary aggregate. Modern monetary theory distinguishes among different types of monetary aggregates, using a categorization system that focuses on the liquidity of the financial instrument used as money.
Market liquidity
Main article:
Market liquidity
Market liquidity describes how easily an item can be traded for another item, or into the common currency within an economy. Money is the most liquid asset because it is universally recognised and accepted as the common currency. In this way, money gives consumers the
freedom to trade goods and services easily without having to barter.
Liquid financial instruments are easily
tradable and have low
transaction costs. There should be no (or minimal)
spread between the prices to buy and sell the instrument being used as money.
Measures of money
The money supply is the amount of financial instruments within a specific economy available for purchasing goods or services. The money supply is usually measured as three escalating categories M1, M2 and M3. The categories grow in size with M1 being currency (coins and bills) and checking account deposits. M2 is currency, checking account deposits and savings account deposits, and M3 is M2 plus
time deposits. M1 includes only the most liquid financial instruments, and M3 relatively illiquid instruments.
Another measure of money, M0, is also used, although unlike the other measures, it does not represent actual purchasing power by firms and households in the economy. M0 is
base money, or the amount of money actually issued by the
central bank of a country. It is measured as currency plus deposits of banks and other institutions at the central bank. M0 is also the only money that can satisfy the
reserve requirements of commercial banks.
Types of money
Currently, most modern monetary systems are based on fiat money. However, for most of history, almost all money was commodity money, such as gold and silver coins. As economies developed, commodity money was eventually replaced by
representative money, such as the
gold standard, as traders found the physical transportation of gold and silver burdensome. Fiat currencies gradually took over in the last hundred years, especially since the breakup of the
Bretton Woods system in the early 1970s.
Also,
money supply
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Definition
The total
supply of
money in
circulation in a given
country's
economy at a given time. There are several measures for the money supply, such as
M1,
M2, and
M3. The money supply is considered an important
instrument for
controlling inflation by those
economists who say that
growth in money supply will only lead to inflation if money
demand is
stable. In
order to
control the money supply,
regulators have to decide which particular
measure of the money supply to
target. The broader the targeted measure, the more difficult it will be to control that particular target. However, targeting an unsuitable
narrow money supply measure may lead to a situation where the total money supply in the country is not adequately controlled.
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Also of interest:
What is meant by the
money supply? The term itself implies that a certain amount of money exists at any given time, even though the quantity may be unknown. In truth there can be no meaningful measure of the quantity because it is continually varying as a function of demand.
The Fed has its own arbitrary measures of the money supply which it once used to help guide its monetary policy decisions. It defines money as the total of cash in circulation and deposit liabilities of banks and thrifts. At one time it set targets for the growth of the money supply. Now it largely ignores its own measures because it has found little correlation between them and its major policy objectives – limiting inflation and unemployment.
Monetary Aggregates
The Fed has defined three monetary aggregates M1, M2, and M3. The narrowest definition, M1, includes the transaction deposits of banks and cash in circulation. M2 adds savings accounts, small time deposits at banks, and retail money market funds. M3 adds large time deposits, repurchase agreements, Eurodollars, and institutional money market funds. In March 2006 the Fed discontinued tracking M3 because it does not convey information about economic activity that is not already embodied in M2.
Note that the Fed's definition of the money supply includes only what the non-bank sector holds. Thus the reserves of banks, i.e. vault cash and deposits at the Fed, though a part of the monetary base, are not included in the monetary aggregates. That means when a bank spends for itself, it increases the money supply. When it receives payments from the public such as interest on loans, the money supply decreases.
Bank Lines of Credit as a Money Equivalent
An important shortcoming of the Fed's definition is that it ignores lines of credit which can be exercised at the discretion of the borrower. Firms often hold substantial lines of credit from their banks, which they can use on short notice. Likewise consumers hold lines of credit in their credit card accounts that are just as useful for purchases as checking accounts or the currency in their wallets. Lines of credit increase
liquidity, which is ultimately what counts in terms of enhancing aggregate demand.
When someone uses a credit card in a purchase, he automatically expands the money supply. The seller receives a new deposit in his account, which increases the total of demand deposits in the banking system -- until the buyer pays off the loan. The result is that consumers who roll over their credit card loans rather than paying them off have increased the money supply on their own initiative by hundreds of billions of dollars. In effect, the money supply is substantially larger and less measurable than the Fed's definition.
The Quantity Theory of Money
Economists regularly use the term
money supply without defining it. A notable example is the equation of exchange in the quantity theory of money.
MV = PT
This relates the money supply, M, and the velocity of money, V, to the average price level, P, and the total number of transactions, T, in a given time period. The equation is simply an
identity, meaning it is true by definition. Yet it is often used to "prove" that the average price level increases with the quantity of money. An identity says nothing about causal relations. The only thing we know is the product MV, which equals the national income, PT, which itself is only roughly measurable. The quantity of money, M, remains undefined and unknowable.
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