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Money supply

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In macroeconomics, the money supply refers to the total volume of money held by the public at a specific time. It is a vital metric used to understand the scale of economic activity within a nation. While many people think only of physical cash, the money supply is much broader. It includes currency in circulation and demand deposits, which are assets easily accessed through financial institutions.

M0-Money supply of the USA
M0-Money supply of the USA

Because definitions of money can vary by country, economists use different categories to organize these assets. These categories help experts track how much liquid wealth is available to spend or invest.

To manage this complexity, economists use monetary aggregates, often labeled as M0, M1, M2, and M3. These labels represent a spectrum from narrow to broad definitions of money. Narrow measures, such as M1, include the most liquid assets. These are things that can be spent immediately, like physical banknotes, coins, and checkable deposits.

India Money Supply Components--Larger Label Fonts
India Money Supply Components--Larger Label Fonts

Broader measures, like M2, add less liquid assets to the mix. These might include savings deposits or certificates of deposit, which are harder to spend instantly. As you move from M1 to M3 or M4, the definition includes more complex financial assets. The specific categories used depend on the traditions of a country's financial institutions.

Money is created through a complex interaction between central banks, commercial banks, and the public. In a fractional-reserve banking system, money is divided into two main types. First, there is central bank money, which includes currency and bank reserves. Second, there is commercial bank money, which includes checking and savings accounts.

Money supply during the great depression era
Money supply during the great depression era

In modern economies, commercial bank money makes up the largest portion of the supply. In the United Kingdom, for example, deposit money outweighs central bank currency by more than 30 to 1. In the United States, the ratio is still more than 8 to 1 because the dollar has a special international role.

Commercial banks act as primary creators of money through the process of lending. When a bank grants a loan, it simultaneously creates a matching deposit in the borrower's account. This action increases the money supply. Conversely, when a borrower pays back the principal of a loan, that money is destroyed.

Money supply growth vs inflation rates
Money supply growth vs inflation rates

Therefore, the total money supply depends on how many loans banks provide and how much currency the public demands. This creates a cycle where the decisions of everyday people and banks influence the entire economy.

Central banks also influence the money supply through monetary policy. One method is through open market operations. To increase the money supply, a central bank can purchase government securities, such as treasury bills. This process converts the illiquid securities of commercial banks into liquid deposits. This increases liquidity in the banking system and typically causes interest rates to fall.

CPI vs M2 money supply increases
CPI vs M2 money supply increases

To "tighten" the money supply, the central bank does the opposite by selling securities. This draws liquid funds out of the system and causes interest rates to rise.

History shows that the role of the money supply in policy has shifted significantly. During the 1970s and 1980s, the monetarist school of thought was very influential. This theory suggested a tight causal connection between money supply growth and inflation. Consequently, many central banks tried to control the money supply by setting stable growth targets. However, this strategy proved impractical because money demand was too unstable. Today, central banks rarely try to control the money supply directly. Instead, they focus on adjusting interest rates to meet specific inflation targets.

Despite this shift, money supply measures remain essential economic indicators. Central bankers monitor these aggregates to judge likely future movements in employment and inflation. They use the data to help make informed decisions about the broader economy.

M2 as a % of GDP
M2 as a % of GDP

By watching these numbers, leaders can better understand the relationship between different parts of the financial system. The money supply remains a foundational concept for understanding how modern global economies function.

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🖼️ Images & Media (14)
File:China M2 money supply vs USA money supply.png
China M2 money supply vs USA money supply.png
File:Money_supply_growth_vs_inflation_rates.png
Money_supply_growth_vs_inflation_rates.png
File:M2 as a % of GDP.png
M2 as a % of GDP.png
File:CPI_vs_M2_money_supply_increases.png
CPI_vs_M2_money_supply_increases.png
File:HKD vs USD over the year.svg
HKD vs USD over the year.svg
File:Money supply of japan.gif
Money supply of japan.gif
File:Money supply Euro.png
Money supply Euro.png
File:M4 money supply.svg
M4 money supply.svg
File:M0-Money supply of the USA.jpg
M0-Money supply of the USA.jpg
File:Money_supply_during_the_great_depression_era.png
Money_supply_during_the_great_depression_era.png
Inflation M2 CPI.webp
File:Australian_Money_Supply.PNG
Australian_Money_Supply.PNG

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