Fiveable
Fiveable
Cram Mode Banner
💶AP Macroeconomics

💶ap macroeconomics review

5.3 Money Growth and Inflation

Verified for the 2025 AP Macroeconomics exam4 min readLast Updated on June 18, 2024

Inflation

Inflation is most certainly the result of increasing the money supply. Think about monetary policies. When the Fed increases the money supply through its open market operations, changing the reserve ratio, and changing the interest rate. This does close the recessionary gap, but it can lead to an inflation. This is the same for deflation. If the money supply decreases, the inflationary gap will be closed, but price level will decrease.

Demand Pull Inflation

Demand-pull inflation is caused by an increase in consumer demand. It happens when AD shifts to the right with consumers spending more. When this happens, the price level increases, but real GDP also increases. This demand-pull is also thought to be caused by too much government deficit spending, because government spending usually drives up AD.

Image Courtesy of Intelligent Economist

Seen in the graph above, AD1 shifts to the right to AD2, increasing both price and real GDP. This is also known as the inflationary gap, and it is corrected through long-run adjustment and contractionary fiscal or monetary policies. 

Cost Push Inflation

Cost-push inflation happens when production is decreased (or input costs increased, thus decreasing amount of production). This can be caused by labor or natural resource shortages as well or natural disasters. Anything that disturbs production and decreases supply is though to be cost-push inflation. 

Image Courtesy of Intelligent Economist

With this type of inflation, supply shortages happen, leading to AS1 (short-run in this case) shifting to the left to AS2. This drives price level to increase but real GDP to decrease. This is a bad example of inflation because it's a little harder to fix. 

Wage-Price Spiral

This is the worst case scenario. It's just a self-perpetuating spiral where demand rises and supply goes down. Imagine if everyone wants to buy more of everything but the supply of everything keeps going down due to a bad hurricane or earthquake? Basically, in this case, demand-pull and cost-push are working together, which is the worst case with inflation. 

Image Courtesy of Wall Street Mojo

Since everything is now at higher prices, it's reasonable that everyone would want higher wages to be able to afford those high costs. This would cause prices to go up even more because it's more expensive to produce now with higher wages. This will lead to more inflation, then higher prices of everything, then higher demand for wages, then higher production costs, then inflation... It just keeps going. 

Image Courtesy of Wikimedia Commons

As seen in the graph, we have a double shifter. AD is shifting to the right, while SRAS is shifting to the left. As a result, real GDP is unchanged, but we still have an increase in price level. 

Inflation due to Changes in the Money Supply

Inflation can also happen due to the changes in money supply. Remember, the Federal Reserve is in charge of the money supply. So everytime they increase or decrease the money supply, price level can be indirectly affected. 

Image Courtesy of Economics Review

MS, meaning money supply, was increase by the Fed. Consequently, the interest rate and quantity of money increased. This indirectly leads to an increase in price, thus inflation. 

Theory of Monetary Neutrality

An increase in money supply increase price level almost proportionately, including the price of labor. This will then increase the cost of production, but it will also increase revenue because selling prices are higher. So the firms will not produce more or less, they'll keep it the same way. That's same with the number of employees as well. 

This goes to households as well. Households will not buy more stuff. Yes, their wages and salaries have risen, but the price of groceries have also risen too. This means that families won't buy another carton of milk. Instead, they'll buy the same number of eggs as they did before inflation. So what does this all mean?

Image Courtesy of Wall Street Mojo

It means that a change in money supply actually has no affect on the economy. Only dollar values are changed, but nothing else. That's the theory of monetary neutrality

The Theory of Monetary Neutrality is the nice way of saying money doesn't matter

Quantity Theory of Money

The equation for the quantity theory of money is M x V = P x Y.  

  • M stands for the money supply (usually M1)
  • V stands for the velocity of money
  • P stands for price
  • Y stands for real output (sometimes T), or GDP

So, the quantity theory of money is the money supply times the velocity of money equals the price level times the real output. So at a constant velocity and GDP, an increase in the money supply will lead to a proportional increase in prices. This is known as the quantity theory of money. It's the idea that inflation is proportional to the growth rate of the money supply. If you think about it, it's true when you look at the equation. Velocity of money is the average times a dollar is spent and re-spent in a specific period of time. It's how fast a (for example) $1 bill moves from one person to the next. If you tend to stash all your cash and never use it, the velocity of money is slow. If you spend it as soon as you receive it, velocity is fast. 

Image Courtesy of Wall Street Mojo

Ex: So let's assume the money supply is 40,anditsusedtopurchase10productswithapriceof40, and it's used to purchase 10 products with a price of 20 each. Calculate the velocity of money.

40xV=40 x V = 20 x 10

40V=40V = 200

V = 200/200/40

V = 5

Key Terms to Review (24)

Cost Push Inflation: Cost push inflation occurs when the overall price levels rise due to increases in the costs of production, such as wages and raw materials. This type of inflation is driven by supply-side factors, meaning that when producers face higher costs, they pass these costs onto consumers in the form of higher prices, leading to a decrease in aggregate supply. This phenomenon highlights the relationship between production costs and overall economic inflation, indicating how external factors can lead to rising prices even in the absence of increased demand.
Deflation: Deflation is the decline in the general price level of goods and services, leading to an increase in the real value of money. This phenomenon often occurs during periods of economic downturns when demand for goods and services falls, resulting in decreased spending by consumers and businesses. Deflation can have significant effects on the economy, influencing money supply, consumer behavior, and overall economic growth.
Demand Pull Inflation: Demand pull inflation occurs when the overall demand for goods and services in an economy exceeds the available supply, leading to an increase in prices. This situation typically arises during periods of strong economic growth, where consumer and business spending drives up demand, while the production of goods and services struggles to keep pace. It highlights the relationship between money supply, aggregate demand, and price levels, showcasing how excess demand can spur inflationary pressures.
Federal Reserve: The Federal Reserve, often referred to as the Fed, is the central banking system of the United States, responsible for regulating the nation's monetary policy and overseeing its financial institutions. Its key functions include controlling the money supply, setting interest rates, and serving as a lender of last resort, which directly influences inflation, economic growth, and overall financial stability.
Government deficit spending: Government deficit spending occurs when a government spends more money than it receives in revenue, resulting in a budget deficit. This practice is often used to stimulate economic growth during downturns, as it can increase overall demand and provide essential services. While it can boost the economy in the short term, persistent deficit spending may lead to increased national debt and potential inflationary pressures.
Gross Domestic Product (GDP): Gross Domestic Product (GDP) is the total monetary value of all final goods and services produced within a country's borders in a specific time period. This measure helps gauge the health of an economy and is closely connected to various economic concepts such as inflation, economic cycles, and the flow of money within the economy.
Inflationary Gap: An inflationary gap occurs when the actual output of an economy exceeds its potential output, leading to upward pressure on prices. This situation typically arises in a growing economy where demand outpaces supply, resulting in increased spending and investment, which can eventually lead to inflation. Understanding the inflationary gap is crucial in analyzing economic conditions and the effectiveness of policy responses.
Inflation: Inflation is the rate at which the general level of prices for goods and services rises, eroding purchasing power. It connects to various economic aspects, affecting interest rates, currency value, and overall economic stability, while also influencing government policies aimed at fostering growth and maintaining a balance in international trade.
Input Costs Increase: Input costs increase refers to the rise in expenses that businesses incur for the materials, labor, and overhead required to produce goods or services. When these costs go up, it can lead to higher prices for consumers and can impact overall economic performance by affecting supply and demand dynamics.
Labor Shortages: Labor shortages occur when the demand for workers in a particular industry or job exceeds the available supply of qualified workers. This imbalance can lead to increased wages and changes in employment practices as employers compete for a limited pool of talent. In the context of money growth and inflation, labor shortages can drive wage inflation, which can further contribute to overall price increases in the economy.
Monetary Policies: Monetary policies are the actions taken by a country's central bank to control the money supply and interest rates in order to achieve macroeconomic goals like controlling inflation, managing employment levels, and stabilizing the currency. These policies influence economic activity by either expanding or contracting the money supply, which can affect consumption, investment, and ultimately, economic growth.
Money supply (M1): Money supply (M1) refers to the total amount of money available in an economy at a particular time, primarily including physical currency, demand deposits, and other liquid assets. M1 is a key measure used to analyze the economy's liquidity and plays a crucial role in understanding how money growth can lead to inflation, as changes in the money supply can influence interest rates, spending, and overall economic activity.
Natural disasters: Natural disasters are severe and extreme events caused by environmental factors that result in significant damage to property, loss of life, and disruption of normal life. These events can include hurricanes, earthquakes, floods, and wildfires, which not only pose immediate threats to communities but also have long-lasting impacts on economies and societies. Their consequences can lead to changes in economic policies and can influence the overall financial stability of affected regions.
Natural resource shortages: Natural resource shortages occur when the demand for natural resources exceeds their supply, leading to scarcity. This concept is crucial in understanding economic dynamics, as shortages can drive up prices, affect production capabilities, and influence inflation rates. When resources like oil, water, or minerals become limited, economies must adapt by finding alternatives, improving efficiency, or adjusting consumption patterns to cope with rising costs and potential economic instability.
Open Market Operations: Open Market Operations refer to the buying and selling of government securities by a central bank in order to control the money supply and influence interest rates. This process is crucial for managing economic stability as it directly affects liquidity in the banking system, impacting borrowing costs and overall economic activity.
Price level (P): The price level is a measure of the average prices of goods and services in an economy at a given time. It reflects the overall inflation or deflation trends within an economy, impacting purchasing power, consumption, and monetary policy decisions. Understanding price levels is essential for analyzing how changes in money supply can lead to inflation or deflation, as a higher money supply typically increases demand, thereby raising the price level.
Production Decrease: Production decrease refers to a reduction in the output of goods and services produced by an economy over a specific period. This decline can result from various factors, such as decreased consumer demand, higher production costs, or disruptions in supply chains. A production decrease can significantly impact economic growth, employment rates, and overall economic stability, often leading to inflationary pressures as fewer goods are available in the market.
Quantity Theory of Money: The Quantity Theory of Money states that the amount of money in an economy is directly proportional to the level of prices of goods and services. This theory explains how changes in the money supply can lead to inflation or deflation, emphasizing that if more money is circulating without a corresponding increase in goods and services, prices will rise. Essentially, it connects the growth of the money supply to inflation, highlighting the relationship between these two economic concepts.
Real output (Y): Real output (Y) refers to the total value of all goods and services produced in an economy, adjusted for inflation, typically measured in constant prices. It reflects the actual productivity of an economy and helps distinguish between nominal values that can be affected by inflation and the true volume of economic activity. Understanding real output is crucial for analyzing the relationship between money supply, inflation, and overall economic health.
Real GDP: Real GDP, or Real Gross Domestic Product, measures the value of all final goods and services produced within a country in a given time period, adjusted for inflation. This adjustment allows for a more accurate comparison of economic output over time, reflecting the true growth and productivity of an economy without the distortions caused by changes in price levels.
Recessionary Gap: A recessionary gap occurs when an economy's actual output is less than its potential output, indicating that resources are not being fully utilized. This gap reflects a period of economic slowdown where unemployment is higher than the natural rate, leading to decreased consumer spending and lower demand for goods and services.
Theory of Monetary Neutrality: The Theory of Monetary Neutrality suggests that changes in the money supply only affect nominal variables, such as prices and wages, without impacting real variables like output and employment in the long run. Essentially, while an increase in the money supply can influence short-term economic activity, over time, prices adjust, and the economy returns to its natural output level. This theory highlights the distinction between real and nominal aspects of the economy, emphasizing that money is neutral in its long-term effects.
Velocity of money (V): The velocity of money is a measure of how quickly money circulates in the economy, reflecting the number of times a unit of currency is spent to buy goods and services within a given period. It connects closely with money growth and inflation, illustrating how changes in the money supply can influence economic activity and price levels. A higher velocity indicates that money is changing hands more frequently, while a lower velocity suggests sluggish economic activity.
Wage-Price Spiral: The wage-price spiral is an economic concept that describes the self-reinforcing relationship between rising wages and increasing prices. When wages increase, consumers have more disposable income, leading to higher demand for goods and services. This increased demand can push prices up, prompting employers to raise wages again to help workers keep up with the cost of living, creating a continuous loop of wage and price increases.