The Basics
- Simple definition: A measure of the average change over time in prices paid by urban consumers for a basket of goods and services.
- Core idea: The most common way to track inflation.
- Think of it as: The economy’s thermometer – tells you if prices are heating up or cooling down.
What It Actually Means
CPI tracks the cost of a fixed basket of goods and services representing typical household consumption – food, housing, clothing, transport, medical care, and education. The basket weights reflect what people actually buy. Price collectors visit markets monthly to record prices. The percentage change in CPI from one period to another is the inflation rate. Core CPI excludes volatile food and energy prices to show underlying trends.
Example
Pakistan’s PBS calculates CPI monthly. If the basket cost Rs. 10,000 last year and Rs. 11,000 this year, inflation is 10%. This tells policymakers and households how much living costs have risen.
Why It Matters (2026)
CPI determines cost-of-living adjustments for wages, pensions, and government benefits. Central banks target CPI inflation. In Pakistan, CPI numbers influence interest rate decisions and IMF program targets.
Don’t Confuse With
GDP Deflator – CPI measures consumer prices; GDP deflator measures prices of all domestically produced goods.
See also
Inflation • Core Inflation • Producer Price Index • GDP Deflator • Basket of Goods
Read more about this with MASEconomics:
A Closer Look at Consumer Price Index
Measuring National Income