Mrunal Patel Unacademy

Inflation: Base Effect vs Momentum Effect — Why Govt's Data Doesn't Match Your Market Experience?

1) 🎁 Win Rs.8 lakh ke prices in Unacademy UCSC Test at 11AM & 5PM https://unacademy.onelink.me/M2BR/9nexlkl0 2) 📡 👩🏻‍🏫 8th April Wednesday Night my Next Win26 Free Economy Class https://unacademy.com/class/mrunals-win26-economy-pill4abc-agrimfgserviceeodipr/CU409Z8A TIMESTAMPS: 00:00 Intro — Inflation Paradox 00:19 Base Effect vs Momentum 00:55 Quick Recap of Both Concepts 01:27 Base Effect with Example 02:43 Real Economic Survey Data 04:20 Why Newspapers Show Lower 04:44 UPSC CDS ExamMCQ 05:30 CPI Base Year Revision DESCRIPTION: Dr. Mrunal Patel, UPSC Educator and Economy Subject Expert, explains one of the most misunderstood concepts in inflation measurement — the Base Effect and Momentum Effect — using real data from the latest Economic Survey. Have you ever noticed that government data claims inflation is falling, but when you visit the market, prices feel just as high or higher? This video explains exactly why that gap exists. Momentum Effect measures how much prices rose compared to the previous month. For example, how much more expensive onions are in April 2026 versus March 2026. Base Effect measures price change compared to the same month last year. For example, how much more expensive onions are in April 2026 versus April 2025. This is the figure reported in newspapers and official CPI headlines. When the base year had unusually high prices, even a genuine price rise in the current year produces a low or negative percentage — making inflation appear controlled on paper while consumers experience real price pressure. Using a simple numerical example: if prices rise by Rs 10 each year (Rs 100 to Rs 110 to Rs 120), the Year 2 inflation is 10%. But Year 3 inflation, calculated on the higher base of Rs 110, works out to only 9.09% — even though the absolute price jump was identical. This is the Base Effect at work. The Economic Survey 2025 graph confirms this: the orange bars (Momentum Effect) were rising through mid-2025, showing real price pressure month-on-month. But the blue bars (Base Effect, the headline CPI figure) were falling — because the prior year's base was already elevated. This concept was directly tested in the UPSC CDS exam. A question asked candidates to evaluate whether the statement "inflation in Year 3 was 21%" was correct when prices moved from Rs 100 to Rs 110 to Rs 121. The correct answer: Year 2 and Year 3 both saw 10% inflation (base effect method), making only Statement 1 correct. The video also notes that the CPI basket itself has been revised — base year updated, weights of different commodities changed. A detailed 30-minute lecture on CPI composition is available on this channel. Economic Survey Analysis for UPSC 2. Why Newspaper Inflation Data Doesn't Match Your Market Experience — UPSC Economy 3. Base Effect in CPI Explained with Real Data — Economic Survey Special TAGS: base effect inflation, momentum effect CPI, CPI base effect UPSC, inflation explained India, Economic Survey 2025 inflation, UPSC economy lecture, headline inflation vs actual inflation, consumer price index explained, UPSC prelims economy, SSC CGL economy, RBI Grade B economy, IBPS economy preparation, CDS exam economy, UPSC free lecture, Mrunal economy, TheMrunalPatel, inflation measurement India, UPSC 2026 preparation, base year effect economics, economy for competitive exams