Understanding Inflation in IB Economics
In IB Economics, inflation refers to the sustained increase in the general price level of goods and services in an economy over time. It reduces the purchasing power of money and affects living standards, investment, and economic policy.
To analyze inflation accurately, economists must measure changes in price levels using statistical tools like the Consumer Price Index (CPI) and Producer Price Index (PPI). For IB students, mastering how inflation is measured is essential to understanding macroeconomic performance indicators under Topic 2: Macroeconomics.
What Is Inflation? | IB Economics Definition
Inflation occurs when average prices in an economy rise, meaning that each unit of currency buys fewer goods and services. Moderate inflation is normal in a growing economy, but high or unpredictable inflation causes economic instability, affecting savings, wages, and investment.
Measuring Inflation | Key IB Economics Methods
1. The Consumer Price Index (CPI)
The CPI is the most widely used measure of inflation. It tracks changes in the cost of a “basket of goods and services” typically purchased by households.
Steps in CPI calculation:
- Select a representative basket of goods and services (e.g., food, housing, transport).
- Collect current and base year prices.
- Calculate the average price change.
- Use the following formula:
CPI = (Cost of basket in current year ÷ Cost of basket in base year) × 100
The percentage change in CPI from one year to the next gives the .
