Inflation definition, types, causes and measurement explained

Inflation rose to a sustained increase in the general price level, eroding purchasing power and prompting policymakers to monitor price indices closely. Understanding its definition, measurement and drivers is essential for anyone tracking macro‑economic trends.

What inflation is and how it’s measured

Inflation is defined as the sustained increase in the overall price level of goods and services within an economy over a period, which directly reduces the purchasing power of each currency unit【1】. Economists typically express the inflation rate as the annual percentage change in a price index, most commonly the Consumer Price Index (CPI) or the Gross Domestic Product (GDP) deflator【1】. In India, the Wholesale Price Index (WPI) tracks wholesale‑level price changes, while the CPI captures consumer‑level price movements, both published by government agencies【1】.

Types and drivers of price rises

Inflation can be classified by the speed of price increases: creeping inflation (under 3 % annually) is considered manageable and may stimulate demand; walking inflation (3‑10 % annually) can overheat an economy if unchecked; galloping inflation (10‑50 % annually) threatens economic stability; and hyperinflation, defined as price rises exceeding 50 % per month, can devastate a currency’s value, as seen historically in Zimbabwe and the Weimar Republic【1】.

The underlying causes are equally diverse. Demand‑pull inflation occurs when excess money and credit boost aggregate demand faster than supply can respond, pushing prices up【1】【2】. Cost‑push inflation stems from rising input costs—such as wages or raw materials—often triggered by supply‑side shocks like labor strikes or natural disasters【1】【2】. Built‑in inflation reflects adaptive expectations that current price trends will continue, prompting workers to demand higher wages and firms to pre‑emptively raise prices【1】【2】. Structural inflation arises from rigid supply chains or monopolistic market structures, while protein inflation specifically targets price hikes in protein‑rich foods due to demand shifts or supply constraints【1】.

What to watch

• Upcoming CPI releases from national statistical agencies, which will indicate whether price pressures are accelerating toward walking or galloping thresholds.
• Central‑bank policy meetings where decisions on interest rates or open‑market operations may be adjusted to curb demand‑pull or cost‑push pressures.
• Commodity market developments, especially for inputs like oil or agricultural products, that could signal emerging cost‑push inflation.

The distinction between measured price changes and the underlying drivers is crucial: while a rising CPI signals higher inflation, the specific mix of demand‑pull, cost‑push, or built‑in factors determines the appropriate policy response. Monitoring the next data points and policy actions will clarify whether inflation remains within manageable creeping levels or escalates toward more disruptive categories.