Understanding Inflation: How Rising Prices Are Measured and Why They Matter
- ▸Inflation is the general rise in the price level of an economy over time, measured most commonly through a Consumer Price Index (CPI) that tracks the cost of a fixed basket of goods and services.
- ▸Economists distinguish demand-pull inflation (too much money chasing too few goods) from cost-push inflation (rising input costs) and built-in inflation (wage-price spirals) — each calls for a different policy response.
- ▸Most central banks, including the RBI, now target inflation directly — India's Monetary Policy Committee targets 4% CPI inflation within a 2-6% tolerance band — because both runaway inflation and deflation carry real economic costs.
Three Kinds of Inflation, Three Different Causes
Demand-pull inflation occurs when aggregate demand outpaces an economy's productive capacity — too much money chasing too few goods. This typically happens during strong economic expansions, after large fiscal stimulus, or when central banks keep interest rates very low for an extended period, encouraging borrowing and spending.
Cost-push inflation comes from the supply side: rising input costs — oil, food commodities, wages, shipping — get passed through to consumer prices even if demand hasn't changed. The 2021-2023 global inflation surge was driven heavily by cost-push factors: pandemic-disrupted supply chains, a global energy shock, and elevated shipping costs.
Built-in inflation, sometimes called a wage-price spiral, is self-reinforcing: workers demand higher wages to keep up with rising prices, businesses raise prices to cover the higher wage bill, and the cycle repeats. Once inflation expectations become "unanchored" this way, it becomes much harder for a central bank to bring inflation back down without inducing a recession.
Headline vs. Core Inflation
Headline inflation is the full CPI figure, including every category. Core inflation strips out food and energy prices, which swing sharply for reasons — a poor harvest, a geopolitical oil shock — that often have little to do with underlying monetary conditions. Central banks watch core inflation closely because it's considered a better gauge of persistent, demand-driven price pressure, even though headline inflation is what households actually feel at the checkout counter.
CPI, WPI, and the GDP Deflator
Countries track more than one price index because each serves a different purpose. The CPI measures what consumers pay at retail. The Wholesale Price Index (WPI) — still used in India for tracking producer and wholesale-level prices, though most inflation-targeting decisions now reference CPI — measures prices at the wholesale or producer stage, before goods reach a shop. The GDP deflator is the broadest of all: it captures price changes across every good and service produced in an economy, not just what a fixed household basket contains, and it's how economists convert nominal GDP into real GDP.
India formally adopted flexible inflation targeting (FIT) in 2016 through an amendment to the RBI Act, establishing a six-member Monetary Policy Committee — three RBI officials and three government-appointed external members — with a mandate to keep CPI-Combined inflation at 4%, within a tolerance band of 2% to 6%. If inflation breaches the band for three consecutive quarters, the RBI is statutorily required to explain the failure to the government, its reasons, and the remedial timeline. India's CPI basket, rebased to 2012=100 by MOSPI, gives food and beverages the largest weight of any major economy's CPI (roughly 46%), which is why food-price shocks — a poor monsoon, an onion price spike — move India's headline inflation far more than they would in the US or Europe.
Primary Sources
Cite This Article
EconoLens Research Desk. (2026, July 13). Understanding Inflation: How Rising Prices Are Measured and Why They Matter. EconoLens. https://econolens.co.in/news/study-understanding-inflation-explained
The EconoLens Research Desk reviews academic papers in economics and econometrics, translating cutting-edge research into accessible analysis. Full credit is given to original authors in every review.