CPI (Consumer Price Index) — Consumer Price Indicator

What is CPI?

CPI (Consumer Price Index), in Polish wskaźnik cen towarów i usług konsumpcyjnych, is the most popular inflation measure. It measures how prices of goods and services purchased by households change.

When you hear "inflation is 4%", that's CPI — prices from the inflation basket rose on average 4% compared to the previous year.

Quick Answer

CPI (Consumer Price Index), in Polish wskaźnik cen towarów i usług konsumpcyjnych, is the most popular inflation measure — it tracks how prices of goods and services bought by households change. GUS builds an inflation basket of ~1,700 products, weights each by Polish spending, collects prices monthly, and computes a weighted average change. Poland reports it year-on-year, month-on-month, and as core CPI (excluding food and energy). It matters because the Monetary Policy Council sets interest rates around it, pensions and contracts are indexed to it, and COI and EDO bonds link coupons to it.

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How is CPI calculated?

1. GUS (Polish Central Statistical Office) establishes inflation basket — set of ~1,700 products and services
2. Each product is assigned a weight (based on Polish spending patterns)
3. Monthly price collection in thousands of sales points
4. Calculates weighted average price change

Formula (simplified): CPI = (basket cost in current period / basket cost in base period) × 100

Types of CPI in Poland

• CPI year-on-year (y/y) — comparison with same month last year (most quoted)
• CPI month-on-month (m/m) — change vs. previous month
• Core CPI (bazowy CPI) — excluding food and energy prices (more stable)

Why is CPI important?

• Interest rates — Monetary Policy Council raises/lowers rates in response to CPI
• Indexation — pensions, alimony, rental contracts often indexed to CPI
• Bonds — COI and EDO give coupons linked to CPI inflation
• Salary negotiations — "raise by inflation" means raise by CPI
• Financial planning — real return rate = nominal minus CPI

CPI vs Your personal inflation

CPI is an average. Your personal inflation may be different:

• If you rent (rents rise faster) — your inflation higher
• If you don't have a car (fuel in basket) — your inflation lower
• If you have children (education, clothing) — depends on year

How Freenance Can Help

Freenance tracks your real expenses and lets you compare them with official CPI. You see whether your personal inflation is higher or lower than the national average.

👉 Check your real inflation with Freenance — freenance.io

Related Articles

• Koszyk inflacyjny — jak GUS mierzy inflację w Polsce
• PPI (Producer Price Index) — wskaźnik cen producentów
• Jak zarządzać finansami w kryzysie gospodarczym — praktyczny poradnik

FAQ

What does CPI actually measure?

CPI measures the average change over time in prices paid by households for a fixed basket of consumer goods and services. In Poland it is published monthly by GUS and is the headline number most people refer to as "inflation".

How is the inflation basket put together?

GUS uses household budget surveys to determine what Polish households actually spend money on, then assigns weights to roughly 1,700 representative products and services. The basket and weights are reviewed annually so they stay representative of real consumption patterns.

What is the difference between headline CPI and core CPI?

Headline CPI covers the full basket including food and energy, which can be volatile due to weather, harvests, or global commodity shocks. Core CPI strips out food and energy to show the underlying inflation trend, which is what central banks watch most closely.

Why is my personal inflation often different from official CPI?

CPI is a national weighted average, so your experience depends on how your spending differs from the basket. Renters, car-free households, families with children, or pensioners typically see meaningfully different inflation than the headline figure.

How does CPI affect interest rates and savings?

The National Bank of Poland adjusts its reference rate partly in response to CPI, which in turn moves WIBOR, deposit rates, and bond coupons. Inflation-linked bonds such as COI and EDO pay coupons explicitly tied to CPI, so the index directly determines part of their return.