What is 'Monetary Base'

A monetary base is the total amount of a currency that is either in general circulation in the hands of the public or in the commercial bank deposits held in the central bank's reserves. This measure of the money supply typically only includes the most liquid currencies; it is also known as the "money base."

BREAKING DOWN 'Monetary Base'

The monetary base is a component of a nation’s money supply. It refers strictly to highly liquid funds including notes, coinage and current bank deposits. When the Federal Reserve creates new funds to purchase bonds from commercial banks, the banks see an increase in their holdings, which causes the monetary base to expand.

For example, country Z has 600 million currency units circulating in the public and its central bank has 10 billion currency units in reserve as part of deposits from many commercial banks. In this case, the monetary base for country Z is 10.6 billion currency units.

As of June 2016, the U.S. had a monetary base of almost $3.9 trillion. 

Monetary Base and the Money Supply

The money supply expands beyond the monetary base to include other assets that may be less liquid in form. It is most commonly divided into levels, listed as M0 through M3 or M4 depending on the system, with each representing a different facet of a nation’s assets. The monetary base’s funds are generally held within the lower levels of the money supply, such as M1 or M2, which encompasses cash in circulation and specific liquid assets including, but not limited to, savings and checking accounts.

To qualify, the funds must be considered a final settlement of a transaction. For example, if a person uses cash to pay a debt, that transaction is final. Additionally, writing a check against money in a checking account, or using a debit card, can also be considered final since the transaction is backed by actual cash deposits once they have cleared.

In contrast, the use of credit to pay a debt does not qualify as part of the monetary base, as this is not the final step to the transaction. This is due to the fact the use of credit just transfers a debt owed from one party, the person or business receiving the credit-based payment and the credit issuer.

Managing Monetary Bases

Most monetary bases are controlled by one national institution, usually a country's central bank. They can usually change the monetary base (either expanding or contracting) through open market operations or monetary policies. 

For many countries, the government can maintain a measure of control over the monetary base by buying and selling government bonds in the open market.

Smaller Scale Monetary Bases and Money Supplies

At the household level, the monetary base consists of all notes and coins in the possession of the household, as well as any funds in deposit accounts. The money supply of a household may be extended to include any available credit open on credit cards, unused portions of lines of credit and other accessible funds that translate into a debt that must be repaid.

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