# Inflation & Business Cycles for UPSC: CPI vs WPI, Core Inflation, 2025-26 Disinflation & the New CPI Series Source: https://tracknation.in/story/inflation-business-cycles-for-upsc-cpi-vs-wpi-core-inflation-2025-26-disinflation-the-new-cpi-series (TrackNation β€” free UPSC notes with PYQs) > Inflation for UPSC β€” disinflation vs deflation vs stagflation, CPI vs WPI vs CPI-IW vs the GDP deflator, demand-pull and cost-push causes, the 2025-26 disinflation (CPI 1.7%, record-low 0.3% in October 2025), the core-inflation puzzle with gold and silver, base vs momentum effect, the new CPI series (base 2024) and the 2026 turn, inflation-control tools, and recession and business-cycle policy β€” with practice questions and real PYQs. ## Inflation Vocabulary and the Price Indices 🎯 **Exam priority: Important.** *Inflation is the hinge between this part and Monetary Policy. UPSC tests which index measures what (CPI vs WPI), the types of inflation, and recession responses β€” and the 2025-26 disinflation plus the February 2026 CPI rebasing are fresh facts.* Prices fell, then they rose β€” and each move showed up in the RBI's decisions. To follow it, you first need to know what is being measured, and how. ## The vocabulary | **Term** | **Meaning** | | **Inflation** | A sustained rise in the general price level (the rate at which it rises β€” e.g. 5% a year) | | **Disinflation** | Inflation is still positive but *falling* (e.g. 6.2% β†’ 1.7%) β€” what India saw in 2025 | | **Deflation** | The price level itself *falls* (negative inflation) β€” often a sign of weak demand | | **Reflation** | Policy-induced rise in prices after a period of deflation or slump | | **Stagflation** | High inflation together with high unemployment and stagnant growth (the 1970s oil shocks) | | **Skewflation** | Prices of only a few items rise sharply while others stay flat β€” distorts the headline | | **Headline vs core** | Headline is overall CPI; **core** strips out volatile *food and fuel* to show underlying demand pressure | | **Hyperinflation** | Extremely rapid, accelerating inflation (conventionally over 50% a month) β€” Weimar Germany, Zimbabwe | ## Which index measures what | **Index** | **Compiled by** | **What it tracks** | **Notes** | | **CPI (Combined)** | NSO, MoSPI | Retail prices of goods and services bought by households (rural + urban) | The RBI's inflation-targeting anchor (4% Β±2%); includes services; food has the largest weight | | **CPI-IW** | Labour Bureau | Retail prices for industrial workers | Used to set the **dearness allowance** of government employees and in wage revisions | | **CPI-AL / CPI-RL** | Labour Bureau | Agricultural and rural labourers | Used in wage fixation under rural schemes | | **WPI** | Office of the Economic Adviser, DPIIT | Wholesale (producer-level) prices of *goods only* | **Excludes services**; weights (2011-12 series) β‰ˆ manufactured 64%, primary articles 23%, fuel & power 13%; food weight is much lower than in CPI | | **GDP deflator** | NSO, MoSPI | Prices of all domestically produced goods and services | Broadest measure; revised with national accounts | - The 2020 UPSC question tested exactly this: the weight of food in CPI is **higher** than in WPI; the WPI does **not** capture changes in the prices of services, which the CPI does; and the RBI has **not** adopted WPI as its key inflation measure β€” it targets CPI. ## Types, Causes and Effects of Inflation Why do prices rise? The cause decides the cure, so UPSC tests causes as a family of types. ## Types and causes - **Demand-pull inflation:** total demand outruns supply β€” "too much money chasing too few goods". Typical triggers are **expansionary monetary policy, fiscal stimulus and rising purchasing power** (rising interest rates have the opposite effect β€” they cool demand). A wage-indexation rule works on the *cost* side, feeding a wage–price spiral, rather than directly on demand. - **Cost-push inflation:** a rise in input costs β€” wages, oil, raw materials, import prices β€” pushes prices up even without extra demand. Supply shocks (a failed monsoon, a war) are the usual trigger. - **Structural / food inflation:** bottlenecks in storage, transport and marketing keep food prices volatile β€” vegetables, pulses and edible oils matter because food has the biggest weight in the CPI. - **Imported inflation:** a weaker rupee or global commodity spikes (crude oil) raise domestic prices. - **Expectations:** if people expect prices to rise, they demand higher wages and raise prices β€” a self-fulfilling spiral. Inflation targeting aims to anchor expectations. ## Who gains and who loses - **Losers:** fixed-income earners (pensioners, salaried people), savers earning less than inflation (negative real interest), creditors whose loans lose value. **Gainers:** borrowers (debt shrinks in real terms), owners of real assets. - **Real interest rate** = nominal interest rate βˆ’ inflation. When inflation is 1.7% and the policy rate 5.25% the real policy rate is high β€” which is why the RBI could cut in 2025 yet rates were still positive in real terms. - **Phillips curve:** a short-run trade-off between inflation and unemployment, the intellectual root of the "growth vs price stability" tension; stagflation of the 1970s broke the simple version. ## 2025-26 Disinflation, the New CPI Series and the 2026 Turn The Economic Survey 2025-26 titles its inflation chapter "Tamed and Anchored". Read the numbers carefully β€” then see what has changed since. ## 2025-26: the sharpest disinflation in the current CPI series - **The path:** average CPI inflation fell from **6.7% in 2022-23** to **4.6% in 2024-25** and **1.7% in 2025-26 (April–December)** β€” the **lowest average in the current CPI series**. The disinflation began in **October 2024** (6.2%) and the reading touched **0.3% in October 2025**, the lowest in the 2012=100 series. - **Why: food.** Favourable weather and higher output pushed **food inflation into deflation from June 2025**; October 2025 saw the biggest monthly fall (βˆ’5.02%). Vegetables stayed deeply negative for much of the year, pulses inflation fell for nearly nine months, spice prices were in deflation for 18 months, and cereal inflation went from 6.2% (January 2025) to βˆ’0.4% (December 2025). - **The base effect** β€” a high price level a year ago mechanically lowers the year-on-year rate β€” outweighed the **momentum effect** (month-on-month price changes) in **seven of nine months**. - **The core puzzle.** Core inflation *rose* from 3.8% (October 2024) to **4.62%** (December 2025) β€” but the Survey shows this is driven by **gold and silver** at lifetime highs; excluding precious metals, core slowed from 3.4% to **2.3%** between June and December. The wedge is about **235 basis points**. - **States:** state-level inflation converged inside the RBI's 2–6% band β€” only **Kerala and Lakshadweep** breached the upper limit β€” and rural inflation is more volatile because food weights are higher. - **Global context:** world headline inflation fell from a **peak of 8.7% (2022) to 4.2% (2025)**; the RBI cut its policy rate by **125 bps** in the year, more than the 75–100 bps by the Fed, ECB and Bank of England. ## The turn: 2026 - The new **CPI series (base 2024=100)** was released in February 2026 (replacing 2012=100): **358 items** (up from 299), **food and beverages weight cut to 36.75%** from 45.86%, weights from the Household Consumption Expenditure Survey 2023-24, COICOP 2018 classification, 12 online markets and live price data for airfares and OTT subscriptions; rural housing is included. The first print β€” January 2026 inflation β€” was **2.75%**. *(Figures from MoSPI's release as reported by news and exam-prep sources β€” confirm on the MoSPI site.)* - Retail inflation rebounded to **4.5% in July and 4.8% in August 2026** (core 4.2%) as West Asia tensions pushed the Indian crude basket from about $82 a barrel in July to **$116.1 in September**. By October 2026 the MPC judged inflation and its outlook "no longer benign": it **raised the repo rate to 5.50%**, changed its stance to calibrated tightening and projected **CPI inflation of 5.2% for 2026-27** (Q3: 6.0%, Q4: 5.7%). A single year thus shows the full cycle: record-low inflation, rate cuts, then a pivot. ## Controlling Inflation and the Business Cycle Controlling inflation is a menu of monetary, fiscal and supply-side tools; UPSC asks which tool fits which cause. ## Policy responses | **Tool** | **Examples** | **Works best against** | | **Monetary** | Raise repo rate; raise CRR; sell securities (OMO); calibrated-tightening stance | Demand-pull inflation; expectations | | **Fiscal** | Cut government spending, raise taxes (reduces demand); reduce excise on fuel; subsidies (supply-side cushion) | Demand-pull; fuel-price shocks | | **Supply-side / administrative** | Buffer stocks and open-market sales; import-duty cuts; stock limits under the Essential Commodities Act; export curbs; Price Stabilisation Fund | Food and cost-push inflation | - **An example from the Survey:** to manage the pulses price cycle the Government used *trade policy and buffer stocks* β€” imposing a **30% import duty on yellow peas** in October 2025 (a close substitute for chana) to protect farmers and avoid a price collapse, and a **10% duty** on masoor and chana. The Survey credits timely trade decisions, buffer-stock management and targeted market interventions for lower pulses price volatility. - The mix has a trade-off: raising rates curbs inflation but slows growth; fixing *MSP* higher raises farmers' incomes but can push up food prices β€” the policy coordination problem between RBI, Finance Ministry and Agriculture Ministry. ## Business cycles: expansion, peak, recession, trough - The economy moves through **expansion β†’ peak β†’ contraction (recession) β†’ trough β†’ recovery**. A **recession** is a significant fall in activity across the economy β€” in the usual rule of thumb, two consecutive quarters of negative real GDP growth (India's 2020-21 contraction was one); a **depression** is a deep, prolonged one (1930s). - **Counter-cyclical policy:** in a recession the government and central bank should **stimulate** β€” cut policy rates, raise public spending, cut taxes. UPSC's 2021 question put it as a choice: the step most likely at the time of a recession is an **increase in expenditure on public projects**, not a rise in tax rates or a cut in public spending. - **Pro-cyclical** policy (cutting spending in a downturn) deepens recessions. **Automatic stabilisers** such as unemployment benefits and progressive taxes soften cycles without any new decision. - India's output gap and growth: after the 2020 contraction, the economy recovered quickly; real GDP growth of 7%+ in the last three years (see Article 2) sits alongside very low inflation in 2025 β€” a "Goldilocks" combination that the October 2026 pivot shows can reverse. ## Further Reading - NCERT Economics textbooks (Class 11–12), the Economic Survey, the Union Budget documents and RBI publications cited in this note β€” the primary sources behind every figure above. ## Test Yourself: Practice Questions & PYQs Ten practice questions on indices, types of inflation, the 2025-26 data and recession policy, followed by real UPSC questions on inflation. ## Practice Questions **Q1.** Consider the following statements: 1. The weight of food in the Consumer Price Index is higher than that in the Wholesale Price Index. 2. The Wholesale Price Index does not capture changes in the prices of services. Which of the statements given above is/are correct? - (a) Neither 1 nor 2 - (b) Both 1 and 2 - (c) 2 only - (d) 1 only **Answer: (b)** β€” CPI tracks what households buy, with food as its largest component; WPI tracks goods at the wholesale level, with a smaller food weight, and omits services. **Q2.** The RBI's inflation-targeting framework uses which of the following as the measure of inflation? - (a) CPI (Combined) - (b) GDP deflator - (c) CPI-IW - (d) WPI **Answer: (a)** β€” The target (4% Β±2%) is defined in terms of CPI (Combined) β€” the headline index compiled by MoSPI. **Q3.** A rise in the overall price level that is caused primarily by an increase in the price of crude oil, with no increase in aggregate demand, is an example of - (a) cost-push inflation - (b) deflation - (c) reflation - (d) demand-pull inflation **Answer: (a)** β€” A higher input cost pushes prices up from the supply side. **Q4.** 'Disinflation' refers to - (a) a rise in the rate of inflation - (b) a fall in the price level - (c) a slowdown in the rate of inflation while prices continue to rise - (d) falling prices accompanied by unemployment **Answer: (c)** β€” In 2025-26 India moved from 6.2% inflation (October 2024) to 0.3% (October 2025) β€” disinflation; deflation would mean negative inflation of the overall price level. **Q5.** Consider the following statements about core inflation: 1. It excludes food and fuel items from the CPI basket. 2. According to the Economic Survey 2025-26, its recent rise was driven largely by precious metals. Which of the statements given above is/are correct? - (a) Neither 1 nor 2 - (b) 1 only - (c) Both 1 and 2 - (d) 2 only **Answer: (c)** β€” Both are right: core inflation was 4.62% in December 2025, but excluding gold and silver it was far lower (about 2.3%). **Q6.** In the context of inflation measurement, the 'base effect' refers to - (a) the influence of prices in the corresponding period of the previous year on the current year-on-year inflation rate - (b) the change in prices month over month - (c) the effect of changing the base year of the index - (d) the effect of the base rate set by banks on prices **Answer: (a)** β€” A high price a year ago makes today's year-on-year inflation look lower, and vice versa; the Survey found the base effect outweighed the momentum effect in seven of nine months of 2025-26. **Q7.** Which of the following is most likely to be done by a government to counter an economic recession? - (a) Increase public spending and cut policy interest rates - (b) Raise taxes and cut public spending - (c) Impose stock limits - (d) Increase the CRR **Answer: (a)** β€” Counter-cyclical policy is expansionary: more spending, lower taxes and cheaper credit. **Q8.** Which one of the following groups is generally hurt the most by unexpected high inflation? - (a) Fixed-income earners such as pensioners - (b) Exporters - (c) Borrowers with fixed-rate loans - (d) Owners of real estate **Answer: (a)** β€” Their incomes do not rise with prices, so the purchasing power of what they receive falls; borrowers with fixed-rate loans gain. **Q9.** Statement-I: In 2025-26, headline CPI inflation in India fell to a record low even though core inflation rose. Statement-II: Food prices, especially vegetables and pulses, declined sharply in 2025-26, and the CPI food weight is large. Which one of the following is correct in respect of the above statements? - (a) Statement-I is correct but Statement-II is not correct - (b) Both Statement-I and Statement-II are correct but Statement-II does not explain Statement-I - (c) Statement-I is not correct but Statement-II is correct - (d) Both Statement-I and Statement-II are correct and Statement-II explains Statement-I **Answer: (d)** β€” The disinflation was driven by food (deflation from June 2025), which has the biggest CPI weight, even as core β€” pushed by gold and silver β€” edged up. **Q10.** The new CPI series introduced by MoSPI in February 2026 differs from the earlier series in that - (a) its base year is 2012 - (b) it has fewer items than the old series - (c) it excludes services - (d) the weight of food and beverages was lowered to about 36.75 per cent **Answer: (d)** β€” The base is 2024=100; the basket rose from 299 to 358 items; and the food weight fell from 45.86% to 36.75% (HCES 2023-24). ### UPSC Previous Year Questions (PYQs) *Real UPSC Prelims questions, checked against the official paper and answer key.* **Q1.** (2021) Which among the following steps is most likely to be taken at the time of an economic recession? - (a) Reduction of expenditure on public projects - (b) Cut in tax rates accompanied by increase in interest rate - (c) Increase in expenditure on public projects - (d) Increase in tax rates accompanied by reduction of interest rate **Answer: (c)** β€” In a recession the government expands demand: more spending on public projects (c). Tax hikes or cuts in public spending would deepen the slump, and raising interest rates also curbs demand. **Q2.** (2021) With reference to Indian economy, demand-pull inflation can be caused/increased by which of the following? 1. Expansionary policies 2. Fiscal stimulus 3. Inflation-indexing wages 4. Higher purchasing power 5. Rising interest rates Select the correct answer using the code given below. - (a) 1, 2, 3 and 5 only - (b) 1, 2 and 4 only - (c) 3, 4 and 5 only - (d) 1, 2, 3, 4 and 5 **Answer: (b)** β€” Demand-pull inflation comes from too much demand: expansionary policies (1), a fiscal stimulus (2) and higher purchasing power (4) all add to demand. Inflation-indexing of wages (3) works on the cost side β€” a wage–price spiral β€” and rising interest rates (5) cool demand, so only 1, 2 and 4 qualify. ### Mains Practice Questions Use these to frame full-length answers. You don't have to answer one exactly β€” they show the angles UPSC tests, so let them guide which points you cover. - Distinguish between CPI and WPI. Which is used by the RBI for inflation targeting and why? - Why does core inflation sometimes diverge from headline inflation? Use the 2025-26 evidence on precious metals and food. - Explain demand-pull and cost-push inflation and the policy tools suited to each. - Examine the factors that brought CPI inflation to record lows in 2025 and why the outlook turned in 2026. ### UPSC Mains β€” Previous Years’ Questions on this topic (last 10 years) These are the **actual GS Mains questions** UPSC has asked on this theme β€” real proof of how, and when, it is tested. Try to write a full answer to each. - 2024 (GS-III): What are the causes of persistent high food inflation in India? Comment on the effectiveness of the monetary policy of the RBI to control this type of inflation. - 2021 (GS-III): Do you agree that the Indian economy has recently experienced V-shaped recovery? Give reasons in support of your answer. - 2019 (GS-III): Do you agree with the view that steady GDP growth and low inflation have left the Indian economy in good shape? Give reasons in support of your arguments.