Inflation — Overview
Learning Objectives
By the end of this section, you should be able to:
- Define inflation and distinguish between CPI and WPI as measurement tools
- Identify the major demand-side and supply-side causes of inflation
- Analyse how inflation affects consumers, businesses, and the broader economy
- Evaluate monetary policy tools used by central banks (RBI, US Fed) to control inflation
- Compare inflation control experiences across India and the United States
- Interpret real-world data such as the 2022 US CPI spike and India's food inflation episodes
Quick Answer
Inflation is a sustained rise in the general price level of goods and services, measured by indices like the Consumer Price Index (CPI) and the Wholesale Price Index (WPI). It erodes purchasing power — the same amount of money buys fewer goods over time. Central banks such as India's Reserve Bank of India and the US Federal Reserve actively manage inflation through interest rate policy, open market operations, and forward guidance. Understanding inflation — its causes, consequences, and control — is fundamental to macroeconomics and shapes everyday decisions about savings, investment, wages, and government policy.
Topics at a Glance
| Topic | What You Will Learn | Key Concept |
|---|---|---|
| Causes of Inflation | Demand-pull vs. cost-push factors, money supply, supply shocks | Monetary and supply-side drivers |
| Consequences of Inflation | Effects on consumers, businesses, savings, inequality | Purchasing power erosion |
| Inflation Control | RBI and Fed policy tools, interest rates, QE, forward guidance | Monetary tightening and easing |
Concept Flow
Key Terms
| Term | Definition | Related Concept |
|---|---|---|
| Inflation | Sustained increase in the general price level over time | CPI, WPI, purchasing power |
| Consumer Price Index (CPI) | Measures price changes for a basket of consumer goods and services | Retail inflation, headline inflation |
| Wholesale Price Index (WPI) | Tracks price changes at the wholesale/producer level | Core inflation, supply-side |
| Demand-Pull Inflation | Inflation caused when aggregate demand exceeds aggregate supply | GDP gap, excess money supply |
| Cost-Push Inflation | Inflation caused by rising production costs passed on to consumers | Supply shock, oil prices |
| Repo Rate | Rate at which the RBI lends to commercial banks; key monetary tool | Interest rate policy |
| Federal Funds Rate | US equivalent of the repo rate, set by the Federal Reserve | Fed policy, US monetary tightening |
| Purchasing Power | The quantity of goods money can buy; falls as inflation rises | Real vs. nominal income |
| Hyperinflation | Extreme, rapid inflation (e.g., Zimbabwe 2008, Weimar Germany 1923) | Currency collapse |
| Quantitative Easing (QE) | Central bank buys assets to inject money into the economy | Accommodative policy |
Related Topics
Prerequisites: Money and Banking, GDP and National Income, Aggregate Demand and Supply
Related Topics: Monetary Policy, Fiscal Policy, Balance of Payments, Business Cycles
Next Topics: Unemployment and the Phillips Curve, Economic Growth, Exchange Rates