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Inflation and Price Indices: WPI, CPI and Exam Notes

Inflation notes for exams: meaning and types, WPI and CPI series and their base years, the GDP deflator, stagflation, and inflation targeting in India.

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Inflation and Price Indices: WPI, CPI and Exam Notes — GK24 title card
Inflation and Price Indices: WPI, CPI and Exam Notes — GK24 title card

Inflation is a sustained rise in the general price level of an economy, which is the same thing as a fall in the purchasing power of money. A rise in the price of one commodity is not inflation; the general level of prices must rise over a period. The opposite, a sustained fall in the general price level, is deflation. Because wages, interest rates, dearness allowance and the whole of monetary policy are tied to these numbers, the way inflation is measured is as important in an examination as the definition itself.

How inflation is measured in India

Inflation is measured through index numbers. A basket of goods and services is fixed in a base year, the base year value is set at 100, and the cost of the same basket is compared in later periods. Indian price indices use the Laspeyres formula, which keeps the base year quantities as the weights. The rate of inflation is the percentage change in the index over the same month of the previous year, which is why it is called the year on year rate.

IndexCompiled byBase year of the current seriesCoverage
Wholesale Price IndexOffice of the Economic Adviser, Department for Promotion of Industry and Internal Trade2011-12Goods traded in bulk in the wholesale market; no services
Consumer Price Index (Combined)National Statistical Office, Ministry of Statistics and Programme Implementation2012Goods and services bought by rural and urban households
CPI for Industrial WorkersLabour Bureau, Ministry of Labour and Employment2016Families of industrial workers; used for dearness allowance
CPI for Agricultural and Rural LabourersLabour Bureau1986-87Agricultural and rural labour households

The Wholesale Price Index has three groups, primary articles, fuel and power, and manufactured products, and manufactured products carry the largest weight. It counts only goods, so a service like a haircut or a school fee never enters it. The Consumer Price Index measures prices at the retail level, includes services and gives the largest weight to food and beverages, which is why a rise in vegetable or cereal prices moves it sharply. The GDP deflator is a third measure, the ratio of nominal GDP to real GDP multiplied by a hundred; it covers every good and service produced in the economy but is available only with the national income data, and so it is the broadest and the slowest measure.

Types of inflation

By cause there are two basic kinds. Demand-pull inflation happens when total demand runs ahead of the supply of goods, as when money supply, government spending or credit grows quickly; too much money chases too few goods. Cost-push inflation happens when the cost of producing goods rises, as with costlier crude oil, higher wages or a fall in the rupee that makes imports dearer; producers pass the cost on. Structural inflation arises from bottlenecks in supply such as poor storage or transport. By speed, economists distinguish creeping inflation of a few per cent a year, walking or trotting inflation, running inflation, and galloping or hyperinflation, in which prices rise so fast that money stops being used; Germany in 1923 and Zimbabwe in the 2000s are the standard examples.

Terms that examiners confuse

  • Deflation: a sustained fall in the general price level, usually with falling demand and output.
  • Disinflation: a fall in the rate of inflation, so prices still rise but more slowly.
  • Reflation: a deliberate policy of raising demand and prices after a period of deflation.
  • Stagflation: high inflation together with stagnation, that is low growth and high unemployment.
  • Skewflation: a sharp rise in the prices of a few items, such as food, while others stay steady.
  • Headline and core inflation: headline inflation is the full index, while core inflation leaves out food and fuel because their prices swing with weather and global markets.

Who gains and who loses

Inflation redistributes income silently. Borrowers gain because they repay loans in money worth less than what they borrowed, while lenders and creditors lose. People on fixed incomes, such as pensioners and salaried workers whose pay is not indexed, lose; holders of real assets like land, gold and shares tend to gain. Producers and traders holding stocks gain from rising prices. Because the poor spend most of their income on food, inflation acts like a hidden tax that falls hardest on them, and it is often called the cruellest tax. A real interest rate is the nominal rate minus the rate of inflation, so when inflation is higher than the interest on a deposit, the saver is losing value even while the balance grows.

Inflation targeting in India

The Reserve Bank of India was given a legal inflation target after the Reserve Bank of India Act was amended in 2016 on the recommendation of the Urjit Patel Committee, which had proposed the consumer price index as the nominal anchor. Under the framework the Central Government fixes the target once in five years in consultation with the Reserve Bank; the target notified in 2016 and again in 2021 was four per cent, with a tolerance band of two percentage points on either side. The rate is judged on the Consumer Price Index (Combined), not on the wholesale index. A six member Monetary Policy Committee decides the policy repo rate, with three members from the Reserve Bank and three appointed by the Central Government; the Governor chairs it and has a casting vote in case of a tie, and the committee meets at least four times a year. If average inflation stays outside the band for three consecutive quarters, the Reserve Bank must report to the Government explaining the failure, the remedial action it proposes and the time it will take. The main tools are the repo rate, the reverse repo and standing deposit facility, the cash reserve ratio and open market operations.

Exam Point of View

Examiners ask four things from this topic. Which body releases which index, and the base year of each series. The difference between the terms, where disinflation against deflation and stagflation against skewflation are the favourite pairs. Who gains and who loses, where the answer is almost always that the borrower gains and the lender loses. And the inflation targeting framework, where the number of members of the Monetary Policy Committee, the index used for the target, the tolerance band and the three consecutive quarters of failure are asked. The standard traps are giving the Reserve Bank as the body that compiles the CPI, saying that the wholesale index includes services, and treating a fall in the inflation rate as deflation.

Important Facts

InflationA sustained rise in the general price level; purchasing power of money falls
WPI compiled byOffice of the Economic Adviser, DPIIT, Ministry of Commerce and Industry
WPI base year2011-12 in the series released in 2017
CPI compiled byNational Statistical Office, Ministry of Statistics and Programme Implementation
CPI base year2012 in the combined series released in 2015
CPI for Industrial WorkersLabour Bureau, base 2016; used to fix dearness allowance
Index formulaLaspeyres index, with base year quantities as weights
GDP deflatorNominal GDP divided by real GDP, multiplied by 100
Core inflationHeadline inflation excluding food and fuel
Inflation targetSet by the Centre every five years under the RBI Act, 1934, as amended in 2016
Target levelFour per cent with a tolerance band of two percentage points on either side
Monetary Policy CommitteeSix members; three from the RBI and three appointed by the Centre
Failure to meet the targetAverage inflation outside the band for three consecutive quarters
Hyperinflation examplesGermany in 1923 and Zimbabwe in the 2000s

Practice MCQs on this topic

Q1.Indian EconomyEasy

Which index does the Reserve Bank of India use to measure inflation for its inflation targeting framework?

  1. A.Wholesale Price Index
  2. B.Consumer Price Index (Combined)
  3. C.Index of Industrial Production
  4. D.GDP deflator
Show answer

Correct answer: B. Consumer Price Index (Combined)

Explanation

The correct answer is B, the Consumer Price Index (Combined). When the flexible inflation targeting framework was adopted after the amendment of the Reserve Bank of India Act in 2016, the combined rural and urban consumer price index released by the National Statistical Office was made the nominal anchor, as the Urjit Patel Committee had recommended. It was chosen because it measures the prices households actually pay and includes services.

Option A, the wholesale price index, was the headline measure before this change, but it covers only goods traded in bulk and no services at all. Option C, the Index of Industrial Production, measures the volume of industrial output and is not a price index. Option D, the GDP deflator, is the broadest price measure but is published only with the national accounts, far too late for a monthly policy decision.

Q2.Indian EconomyMedium

The Wholesale Price Index in India is compiled and released by which body?

  1. A.The Reserve Bank of India
  2. B.The Labour Bureau
  3. C.The Office of the Economic Adviser
  4. D.The National Statistical Office
Show answer

Correct answer: C. The Office of the Economic Adviser

Explanation

The correct answer is C, the Office of the Economic Adviser. The wholesale price index is compiled and released every month by the Office of the Economic Adviser in the Department for Promotion of Industry and Internal Trade, under the Ministry of Commerce and Industry. Its three groups are primary articles, fuel and power, and manufactured products, and the series released in 2017 has 2011-12 as its base year.

Option A, the Reserve Bank of India, uses price indices for monetary policy but does not compile them. Option B, the Labour Bureau under the Ministry of Labour and Employment, compiles the consumer price indices for industrial workers and for agricultural and rural labourers. Option D, the National Statistical Office, compiles the combined consumer price index and the national accounts.

Q3.Indian EconomyEasy

Inflation that is caused by aggregate demand rising faster than the supply of goods and services is called:

  1. A.Cost-push inflation
  2. B.Demand-pull inflation
  3. C.Structural inflation
  4. D.Imported inflation
Show answer

Correct answer: B. Demand-pull inflation

Explanation

The correct answer is B, demand-pull inflation. It is described in the classic phrase as too much money chasing too few goods. A rapid growth of money supply, a large increase in government spending, easy credit or a sudden rise in exports can push total demand beyond what the economy can produce at current prices, and prices then rise to clear the market.

Option A, cost-push inflation, works from the supply side, when costlier crude oil, higher wages or dearer imported inputs raise the cost of production and producers pass it on. Option C, structural inflation, comes from bottlenecks such as poor storage, weak transport or shortages of skilled labour. Option D, imported inflation, is a form of cost-push in which a fall in the value of the currency or a rise in world prices makes imports dearer.

Q4.Indian EconomyMedium

A situation of high inflation along with stagnant growth and high unemployment is known as:

  1. A.Reflation
  2. B.Disinflation
  3. C.Stagflation
  4. D.Deflation
Show answer

Correct answer: C. Stagflation

Explanation

The correct answer is C, stagflation. The word joins stagnation and inflation, and it describes the awkward situation in which prices are rising fast while output is flat and unemployment is high. It is difficult to treat, because raising interest rates to control prices depresses output further, while stimulating demand to create jobs pushes prices higher still. The oil shocks of the 1970s produced the best known episode of stagflation in the world economy.

Option A, reflation, is a deliberate policy of raising demand and prices after deflation. Option B, disinflation, is a fall in the rate of inflation while prices still rise. Option D, deflation, is an actual fall in the general price level and usually goes with weak demand rather than with high inflation.

Q5.Indian EconomyEasy

During a period of high inflation, which of the following groups usually gains?

  1. A.Borrowers
  2. B.Lenders
  3. C.Pensioners
  4. D.Holders of fixed deposits
Show answer

Correct answer: A. Borrowers

Explanation

The correct answer is A, borrowers. A loan is repaid in a fixed number of rupees, and inflation reduces what those rupees can buy. The borrower therefore returns money of smaller real value than the money received, so the real burden of the debt falls. Producers and traders who hold stocks of goods gain in the same way, since the value of what they hold rises with the price level.

Option B, lenders, lose for the same reason, because the interest they receive may not even cover the loss of purchasing power. Option C, pensioners, live on fixed payments and lose unless the pension is indexed to prices. Option D, holders of fixed deposits, earn a fixed nominal rate; when inflation is higher than that rate the real return is negative and their savings shrink in value.

Q6.Indian EconomyMedium

A fall in the rate of inflation, while the general price level is still rising, is called:

  1. A.Deflation
  2. B.Disinflation
  3. C.Stagflation
  4. D.Skewflation
Show answer

Correct answer: B. Disinflation

Explanation

The correct answer is B, disinflation. If the inflation rate falls from seven per cent to five per cent, prices are still higher than last year but they are rising more slowly. That slowing is disinflation, and it is normally what a central bank is trying to achieve when it raises interest rates to fight high inflation.

Option A, deflation, means that prices themselves are falling and the inflation rate has become negative, which signals weak demand and is far more damaging. Option C, stagflation, is high inflation with low growth and high unemployment. Option D, skewflation, is a sharp rise in the prices of a few commodities, typically food, while the general price level stays broadly stable. This question is a favourite because candidates read deflation and disinflation as the same idea.

Q7.Indian EconomyMedium

How many members does the Monetary Policy Committee of the Reserve Bank of India have?

  1. A.Four
  2. B.Five
  3. C.Six
  4. D.Seven
Show answer

Correct answer: C. Six

Explanation

The correct answer is C, six. The Monetary Policy Committee set up under the amended Reserve Bank of India Act has six members. Three are from the Reserve Bank, namely the Governor, the Deputy Governor in charge of monetary policy and an officer of the Bank nominated by its Central Board, and three are external members appointed by the Central Government. The Governor chairs the committee and has a casting vote if the votes are equally divided, the quorum is four members and the committee must meet at least four times a year.

Options A, B and D give the wrong strength. The committee decides the policy repo rate by majority, and its resolution is published with the votes of each member, which is a further detail examiners like to ask.

Q8.Indian EconomyMedium

Which of the following is NOT covered by the Wholesale Price Index in India?

  1. A.Primary articles
  2. B.Fuel and power
  3. C.Manufactured products
  4. D.Services
Show answer

Correct answer: D. Services

Explanation

The correct answer is D, services. The wholesale price index is built entirely from the prices of goods traded in bulk, and it has exactly three major groups: primary articles, fuel and power, and manufactured products, of which manufactured products carry the largest weight. A haircut, a school fee, a bus fare or a doctor's charge never enters the index, even though services make up more than half of the country's output. A separate producer price index that would cover services has long been under preparation.

Options A, B and C name the three groups that the index does cover, so none of them can be the answer. The absence of services is one reason the consumer price index, which includes them, was preferred as the anchor for monetary policy.

Q9.Indian EconomyMedium

If the nominal rate of interest on a deposit is 6 per cent and the rate of inflation is 8 per cent, the real rate of interest is:

  1. A.14 per cent
  2. B.2 per cent
  3. C.Minus 2 per cent
  4. D.8 per cent
Show answer

Correct answer: C. Minus 2 per cent

Explanation

The correct answer is C, minus 2 per cent. The real rate of interest is the nominal rate less the rate of inflation, an approximation known as the Fisher equation. Here six per cent minus eight per cent gives minus two per cent, so the deposit grows in rupees but buys less at the end of the year than the original sum would have bought at the start. Savers lose in real terms whenever inflation is higher than the interest they earn, and that is a common condition in an economy with high inflation and administered deposit rates.

Option A adds the two rates instead of subtracting them. Option B subtracts in the wrong direction and gives a positive real return. Option D simply repeats the inflation rate and ignores the interest earned.

Q10.Indian EconomyHard

The GDP deflator is calculated as:

  1. A.Real GDP divided by nominal GDP, multiplied by 100
  2. B.Nominal GDP divided by real GDP, multiplied by 100
  3. C.Nominal GDP minus real GDP
  4. D.GDP at factor cost divided by population
Show answer

Correct answer: B. Nominal GDP divided by real GDP, multiplied by 100

Explanation

The correct answer is B, nominal GDP divided by real GDP, multiplied by 100. Nominal GDP is measured at current prices and real GDP at the prices of a base year, so the ratio between them isolates the effect of the change in prices. The deflator is the broadest price measure available, because it covers every good and service produced within the country, and unlike the wholesale and consumer indices its basket changes as the composition of output changes.

Option A inverts the formula and would fall when prices rise. Option C gives an absolute difference in rupees, not an index number. Option D describes per capita GDP, which measures income per head and has nothing to do with the measurement of prices. A deflator of 120 means that prices in the current year are twenty per cent above the base year level.

Frequently Asked Questions

What is the difference between the WPI and the CPI?

The Wholesale Price Index measures the prices at which goods are traded in bulk, before they reach the consumer, and it covers only goods. The Consumer Price Index measures retail prices paid by households and includes services such as education, health and transport. The CPI gives a heavy weight to food, so it moves with vegetable and cereal prices, while the WPI is dominated by manufactured products and reacts to fuel and metal prices. The Reserve Bank uses the CPI for its inflation target.

What is the difference between deflation and disinflation?

Deflation is a fall in the general price level itself, so the index number goes down and the inflation rate is negative. Disinflation is a fall in the rate of inflation while prices are still rising, as when inflation comes down from six per cent to four per cent. Deflation is a sign of weak demand and is feared because people postpone spending; disinflation is usually the aim of a central bank that is fighting high inflation.

Why is inflation called the cruellest tax?

Inflation takes away purchasing power without any law being passed, and it takes proportionately more from the poor. Poor households spend most of their income on food and fuel, hold their savings in cash and have no assets whose price rises with inflation, so they cannot protect themselves. Rich households hold land, gold and shares whose prices tend to rise with the price level. The burden therefore falls hardest on those least able to bear it, which is why it is called a hidden or cruel tax.

What is core inflation and why is it watched?

Core inflation is the headline rate with food and fuel taken out. The prices of vegetables, pulses and crude oil swing with the monsoon, the harvest and world markets, and those swings reverse on their own. Core inflation therefore shows the underlying trend in prices that monetary policy can actually influence, and a central bank watches it to decide whether a rise in the headline rate is temporary or lasting.

What happens if the Reserve Bank fails to keep inflation within the band?

A failure is defined as average inflation being above the upper tolerance level or below the lower tolerance level for three consecutive quarters. When that happens the Reserve Bank must send a report to the Central Government stating the reasons for the failure, the remedial actions it proposes and an estimate of the time within which the target will be met. The report is a statutory requirement under the amended Reserve Bank of India Act.

Sources

  • Indian Economic Development (Class XI), chapters on money, banking and economic reform — NCERT
  • Introductory Macroeconomics (Class XII), chapter on money and banking — NCERT
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