What Is Inflation?
Inflation is the decline in purchasing power of a given currency over time. A quantitative estimate of the rate at which the decline in purchasing power occurs can be reflected in the increase of the average price level of a basket of selected goods and services in an economy over some period of time.
The rise in the general level of prices often expressed as a percentage, means that a unit of currency effectively buys less than it did in prior periods.
Inflation can be contrasted with deflation, which occurs when the purchasing power of money increases and prices decline.
- Inflation is the rate at which the value of a currency is falling and, consequently, the general level of prices for goods and services is rising.
- Inflation is sometimes classified into three types: demand-pull inflation, cost-push inflation, and built-in inflation.
- The most commonly used inflation indexes are the Consumer Price Index (CPI) and the Wholesale Price Index (WPI).
- Inflation can be viewed positively or negatively depending on the individual’s viewpoint and rate of change.
- Those with tangible assets, like property or stocked commodities, may like to see some inflation as it raises the value of their assets.
While it is easy to measure the price changes of individual products over time, human needs extend beyond one or two such products. Individuals need a broad and diversified set of products as well as a host of services for living a comfortable life.
They include commodities like food grains, metal, fuel, utilities like electricity and transportation, and services like healthcare, entertainment, and labor.
Inflation aims to measure the overall impact of price changes on a diversified set of products and services and allows for a single value representation of the increase in the price level of goods and services in an economy over a period of time.
The U.S. Bureau of Labor Statistics (BLS) reported that the Consumer Price Index for All Urban Consumers (CPI-U) was up by 7.5% in the 12-month period ending January 2022, the largest 12-month increase since the period ending June 1982.
As a currency loses value, prices rise and it buys fewer goods and services. This loss of purchasing power impacts the general cost of living for the common public, which ultimately leads to a deceleration in economic growth.
The consensus view among economists is that sustained inflation occurs when a nation’s money supply growth outpaces economic growth.
To combat this, a country’s appropriate monetary authority, like the central bank, then takes the necessary measures to manage the supply of money and credit to keep inflation within permissible limits and keep the economy running smoothly.
Theoretically, monetarism is a popular theory that explains the relationship between inflation and the money supply of an economy.
For example, following the Spanish conquest of the Aztec and Inca empires, massive amounts of gold and silver flowed into the Spanish and other European economies. Since the money supply had rapidly increased, the value of money fell, contributing to rapidly rising prices.
Inflation is measured in a variety of ways depending upon the types of goods and services considered and is the opposite of deflation, which indicates a general decline occurring in prices for goods and services when the inflation rate falls below 0%.
Causes of Inflation
An increase in the supply of money is the root of inflation, though this can play out through different mechanisms in the economy.
Money supply can be increased by the monetary authorities either by printing and giving away more money to the individuals, by legally devaluing (reducing the value of) the legal tender currency, more (most commonly) by loaning new money into existence as reserve account credits through the banking system by purchasing government bonds from banks on the secondary market.
In all such cases of money supply increases, the money loses its purchasing power. The mechanisms by which this drives inflation can be classified into three types: demand-pull inflation, cost-push inflation, and built-in inflation.
Demand-pull Inflation occurs when an increase in the supply of money and credit stimulates overall demand for goods and services in an economy to increase more rapidly than the economy’s production capacity. This increases demand and leads to price rises.
With more money available to individuals, positive consumer sentiment leads to higher spending, and this increased demand pulls prices higher. It creates a demand-supply gap with higher demand and less flexible supply, which results in higher prices.
Cost-push inflation is a result of the increase in prices working through the production process inputs. When additions to the supply of money and credit are channeled into a commodity or other asset markets and especially when this is accompanied by a negative economic shock to the supply of key commodities, costs for all kinds of intermediate goods rise.
These developments lead to higher costs for the finished product or service and work their way into rising consumer prices.
For instance, when the expansion of the money supply creates a speculative boom in oil prices, the cost of energy for all sorts of uses can rise and contribute to rising consumer prices, which is reflected in various measures of inflation.
Built-in inflation is related to adaptive expectations, the idea that people expect current inflation rates to continue in the future. As the price of goods and services rises, workers and others come to expect that they will continue to rise in the future at a similar rate and demand more costs or wages to maintain their standard of living.
Their increased wages result in a higher cost of goods and services, and this wage-price spiral continues as one factor induces the other and vice versa.
Types of Price Indexes
Depending upon the selected set of goods and services used, multiple types of baskets of goods are calculated and tracked as price indexes. The most commonly used price indexes are the Consumer Price Index (CPI) and the Wholesale Price Index (WPI).
The Consumer Price Index
The CPI is a measure that examines the weighted average of prices of a basket of goods and services that are of primary consumer needs. They include transportation, food, and medical care.
CPI is calculated by taking price changes for each item in the predetermined basket of goods and averaging them based on their relative weight in the whole basket. The prices in consideration are the retail prices of each item, as available for purchase by the individual citizens.
Changes in the CPI are used to assess price changes associated with the cost of living, making it one of the most frequently used statistics for identifying periods of inflation or deflation.
In the U.S., the Bureau of Labor Statistics reports the CPI on a monthly basis and has calculated it as far back as 1913.
The Consumer Price Index has been revised six times. The Consumer Price Index for All Urban Consumers (CPI-U), introduced in 1978, is representative of the buying habits of approximately 80% of the non-institutional population of the United States.
The Wholesale Price Index
The WPI is another popular measure of inflation that measures and tracks the changes in the price of goods in the stages before they reach the retail level. While WPI items vary from one country to another, they mostly include items at the producer or wholesale level.
For example, it includes cotton prices for raw cotton, cotton yarn, cotton gray goods, and cotton clothing.
Although many countries and organizations use WPI, many other countries, including the U.S., use a similar variant called the producer price index (PPI).
The Producer Price Index
The producer price index is a family of indexes that measures the average change in selling prices received by domestic producers of intermediate goods and services over time. The PPI measures price changes from the perspective of the seller and differs from the CPI which measures price changes from the perspective of the buyer.
In all such variants, it is possible that the rise in the price of one component (say, oil) cancels out the price decline in another (say, wheat) to a certain extent.
Overall, each index represents the average weighted price change for the given constituents which may apply at the overall economy, sector, or commodity level.
The Formula for Measuring Inflation
The above-mentioned variants of the price index can be used to calculate the value of inflation between two particular months (or years).
While a lot of ready-made inflation calculators are already available on various financial portals and websites, it is always better to be aware of the underlying methodology to ensure accuracy with a clear understanding of the calculations. Mathematically,
Percent inflation rate = (Final CPI Index Value/Initial CPI Value)*100
Say you want to know how the purchasing power of $10,000 changed between September 1975 and September 2018. One can find price index data on various portals in a tabular form. From that table, pick up the corresponding CPI figures for the given two months.
For September 1975, it was 54.6 (Initial CPI value) and for September 2018, it was 252.439 (Final CPI value). Plugging in the formula yields:
Percent inflation rate = (252.439/54.6)*100 = (4.6234)*100 = 462.34%
Since you wish to know how much $10,000 of September 1975 would worth be in September 2018, multiply the percent inflation rate with the amount to get the changed dollar value:
Change in dollar value = 4.6234 * $10,000 = $46,234.25
This means that $10,000 in September 1975 will be worth $46,234.25. Essentially, if you purchased a basket of goods and services (as included in the CPI definition) worth $10,000 in 1975, the same basket would cost you $46,234.25 in September 2018.
Extreme Examples of Inflation
Since all world currencies are fiat money, the money supply could increase rapidly for political reasons, resulting in rapid price level increases. The most famous example is the hyperinflation that struck the German Weimar Republic in the early 1920s.
The nations that had been victorious in World War I demanded reparations from Germany, which could not be paid in German paper currency, as this was of suspect value due to government borrowing. Germany attempted to print paper notes, buy foreign currency with them, and use that to pay their debts.
This policy led to the rapid devaluation of the German mark, and hyperinflation accompanied the development. German consumers responded to the cycle by trying to spend their money as fast as possible, understanding that it would be worthless and less the longer they waited.
More and more money flooded into the economy, and its value plummeted to the point where people would paper their walls with practically worthless bills. Similar situations have occurred in Peru in 1990 and Zimbabwe in 2007–2008.
What Causes Inflation?
There are three main causes of inflation: demand-pull inflation, cost-push inflation, and built-in inflation. Demand-pull inflation refers to situations where there are not enough products or services being produced to keep up with demand, causing their prices to increase.
Cost-push inflation, on the other hand, occurs when the cost of producing products and services rises, forcing businesses to raise their prices.
Lastly, built-in inflation—sometimes referred to as a “wage-price spiral”—occurs when workers demand higher wages to keep up with rising living costs. This in turn causes businesses to raise their prices in order to offset their rising wage costs, leading to a self-reinforcing loop of wage and price increases.
Is Inflation Good or Bad?
Too much inflation is generally considered bad for an economy, while too little inflation is also considered harmful. Many economists advocate for a middle-ground of low to moderate inflation, of around 2% per year.
Generally speaking, higher inflation harms savers because it erodes the purchasing power of the money they have saved. However, it can benefit borrowers because the inflation-adjusted value of their outstanding debts shrinks over time.
What Are the Effects of Inflation?
Inflation can affect the economy in several ways. For example, if inflation causes a nation’s currency to decline, this can benefit exporters by making their goods more affordable when priced in the currency of foreign nations.
On the other hand, this could harm importers by making foreign-made goods more expensive. Higher inflation can also encourage spending, as consumers will aim to purchase goods quickly before their prices rise further.
Savers, on the other hand, could see the real value of their savings erode, limiting their ability to spend or invest in the future.