Inflation measurement must take global best practices into account and arrive at the right estimate of inflation as Inflation is the gradual loss of purchasing power of a given currency. A quantitative estimate of the rate at which purchasing power declines can be reflected in the increase in an economy's average price level of a basket of selected goods and services over time. Since inflation gives a picture of where the economy is heading, measuring inflation is a very important task.

In this article, let us see how to measure Inflation, the different ways to measure Inflation, and which method is used to measure Inflation in India with reasons.

How to Measure Inflation?

• A simple way to measure inflation is to compare the current prices of goods and services to the base year (target year of comparison). (To read more on this topic, click here Base Year)
• Let us consider we can buy 1 liter of milk for Rs. 50 at the current time. Exactly 1 year before 1 liter of milk cost us Rs. 40.
• Here there is an increase of Rs. 10 per liter of milk or the purchasing power of Rs.40 has reduced from buying 1 liter of milk to 800ml of milk in 1 year.

• Therefore we can say that there is an inflation of 25% in milk prices compared to last year.
• However, while calculating the inflation in an economy we consider different goods while calculating the inflation rate at different levels.
• Generally, inflation is measured in the following 3 places:
  • At Consumer Level - Consumer Price Index (CPI)
  • At Wholesale Level - Wholesale Price Index (WPI)
  • At Producers Level - Producers Price Index (PPI)

Different ways to measure inflation

Consumer Price Index

• Consumers frequently purchase directly from retailers. As a result, the inflation experienced in retail stores is a true reflection of the country's price rise. It also depicts the cost of living more accurately.
• The Consumer Price Index is the name given in India to the index that shows the rate of inflation at the retail level (CPI). The CPI basket comprises 448 items in rural and 460 items in urban.
• There were four Consumer Price Indices in the economy, each covering a different socioeconomic group. Consumer Price Index for Industrial Workers (CPI-IW), Consumer Price Index for Agricultural Laborers (CPI-AL), Consumer Price Index for Rural Laborers (CPI-RL), and Consumer Price Index for Urban Non-Manual Employees were the four indices (CPI-UNME).
• CPI is now using a new series based on the base year 2012=100 for all of India as well as States/UTs separately for rural, urban, and combined. Consumer Price Indices are published by the Central Statistics Office (CSO), Ministry of Statistics, and Program Implementation.
• The Consumer Price Index (CPI) is based on retail prices and is used to calculate the Dearness Allowance (DA) for government employees.

Note: CSO is merged into National Statistical Office (NSO) post-2019.

Wholesale Price Index

• In India, this was the most widely used method for calculating the inflation rate. The Wholesale Price Index (WPI) is the index used to calculate wholesale inflation.
• This rate of inflation is commonly referred to as headline inflation. The Office of Economic Advisor, Ministry of Commerce and Industry publishes the WPI. The base year is aligned with CPI as 2012=100.
• Prior to 2014, the RBI used WPI to make the majority of its policy decisions. However, the WPI-based inflation calculation was not false proof. WPI displays the total price of a commodity basket of 697 items.
• However, WPI excludes services and does not account for bottlenecks between producers and wholesalers or between wholesalers and retailers (consumer).
• As a result, as part of the reforms initiated by RBI governor Raghu Ram Rajan, the RBI shifted to CPI for policy decisions beginning in 2014.

Producers Price Index

• To begin, PPI estimates the change in average prices received by producers, whereas CPI measures the change in average prices paid by consumers.
• The prices received by producers differ from the prices paid by consumers due to a variety of factors such as taxes, trade, and transport margins, distribution costs, and so on.
• The PPI is derived from the Supply Use Table.
• The PPI estimates are used as deflators and for contract indexation, among other things.
• There is currently no index in India that measures inflation at the producer level. Although a Producer Price Index (PPI) is proposed, this type of inflation calculation has yet to begin in India.
• The new changes to WPI and excluding taxes while calculating WPI are bringing it closer to PPI indication.

Measuring Inflation in India

• Till 2014 India was using the Wholesale Price Index (WPI) to calculate the inflation rate in the economy.
• However, in 2014 as part of the reforms initiated by RBI governor Raghu Ram Rajan, the RBI shifted to CPI for better transmission of policy decisions.
• Since WPI had excluded services and had nearly a quarter of weightage assigned to fuel and metals it was decided to switch to CPI which included services like education, healthcare and reflect the true inflation at the consumer level.

Conclusion

Unchecked inflation can ruin the whole economy. Therefore a clear measurement of inflation is needed to make policy decisions in keeping the inflation rates in check. Both the government and the central bank (Reserve Bank) attempt to combat inflation through their fiscal and monetary policies, which are referred to as Fiscal and Monetary Policies, respectively. A true picture of inflations helps in better policy formation.

GS Mains Questions and Model Answers

Q1: Explain the importance of measuring inflation and its impact on the Indian economy.

Answer: Measuring inflation is crucial because it provides an understanding of price stability in an economy. Inflation indicates how much the general price level of goods and services is rising, affecting purchasing power and cost of living. In the Indian economy, inflation affects various stakeholders, including consumers, businesses, and policymakers. A moderate level of inflation is often seen as a sign of economic growth, but high inflation erodes purchasing power, increases input costs for businesses, and can lead to wage-price spirals. It also affects savings and investments, as inflation reduces the real value of money over time. Measuring inflation through indices like the Consumer Price Index (CPI) and Wholesale Price Index (WPI) helps policymakers make informed decisions about monetary and fiscal policies to control price levels and ensure economic stability. Effective inflation measurement is essential for setting interest rates, adjusting wages, and managing the overall economic health of the country.

Q2: Discuss the different methods of measuring inflation in India and how they help in policy formulation.

Answer: In India, inflation is primarily measured through the Consumer Price Index (CPI) and Wholesale Price Index (WPI). The CPI measures price changes at the consumer level, reflecting the impact of inflation on households by tracking the prices of goods and services purchased by them. It is used as the main indicator for setting inflation targets and adjusting wages. The WPI, on the other hand, tracks price changes at the wholesale level, focusing on the price movements of goods sold in bulk. Both indices help policymakers gauge inflationary trends in different sectors of the economy. The Reserve Bank of India (RBI) uses the CPI as the primary metric for inflation targeting under its monetary policy framework. By understanding inflation trends through these indices, the government and RBI can implement appropriate monetary and fiscal measures to control inflation, such as adjusting interest rates, managing money supply, or intervening in markets to stabilize prices. Together, these methods provide comprehensive insights into price movements and economic health.

Q3: Analyze the role of the Reserve Bank of India (RBI) in controlling inflation through monetary policy.

Answer: The Reserve Bank of India (RBI) plays a pivotal role in controlling inflation through its monetary policy tools. Its primary objective is to maintain price stability while fostering economic growth. The RBI uses several instruments to control inflation, including the repo rate, reverse repo rate, Cash Reserve Ratio (CRR), and open market operations (OMOs). By adjusting the repo rate, which is the rate at which banks borrow from the RBI, the central bank can influence the cost of borrowing and lending in the economy. A higher repo rate reduces money supply, thereby controlling inflation, while a lower repo rate stimulates borrowing and spending, potentially increasing inflation. The RBI also uses OMOs to buy or sell government securities, thereby influencing liquidity in the financial system. In addition, the RBI’s inflation-targeting framework, established in 2016, mandates it to maintain inflation within a target range (currently 4% ± 2%). By using these tools, the RBI ensures that inflation remains under control, contributing to the overall stability and growth of the Indian economy.

Previous Year Questions on Measuring Inflation

1. UPSC CSE 2018

Question: Discuss the different measures of inflation in India and their relevance in policymaking. 

Answer: In India, inflation is measured primarily through the Consumer Price Index (CPI) and the Wholesale Price Index (WPI). The CPI reflects the changes in prices of goods and services purchased by consumers, such as food, housing, and healthcare. It is the most widely used measure for gauging inflation at the retail level. The WPI, on the other hand, tracks price changes at the wholesale level, focusing on goods traded in bulk. The CPI is more relevant for assessing the impact of inflation on households, while the WPI is used for analyzing inflationary trends in the production and distribution stages of the economy. Both indices play a significant role in policymaking. The Reserve Bank of India (RBI) uses the CPI for inflation targeting under its monetary policy framework. A proper understanding of these inflation measures helps policymakers formulate fiscal and monetary strategies to stabilize prices, adjust interest rates, and ensure economic growth. Accurate inflation measurement is crucial for addressing price volatility and maintaining consumer purchasing power.

2. UPSC CSE 2019

Question: Explain the impact of inflation on different sectors of the economy and how it is controlled by the RBI. 

Answer: Inflation affects various sectors of the economy differently. For consumers, rising inflation erodes purchasing power, leading to a higher cost of living. For businesses, inflation increases input costs, which can reduce profit margins and lead to higher prices for goods and services. In the financial sector, inflation diminishes the value of savings, making it harder for individuals to maintain the real value of their wealth. On the other hand, moderate inflation can be beneficial for producers as it may signal growing demand. The Reserve Bank of India (RBI) controls inflation using several monetary policy tools. The repo rate is a key instrument; by increasing the repo rate, the RBI makes borrowing more expensive, reducing the money supply and cooling down inflation. Additionally, the RBI conducts open market operations (OMOs) to manage liquidity and uses the Cash Reserve Ratio (CRR) to control the amount of funds banks can lend. Through these measures, the RBI maintains inflation within a target range, ensuring price stability while fostering economic growth.