Commodity Price Index
A commodity price index tracks a weighted basket of raw-material benchmark prices; learn how weights, currency, composition, and market conventions affect interpretation.
Compare CPI, PCE, PPI, commodity indexes, RPIX, price indexes, and price levels by scope, weights, formula, and financial use.
Consumer, Producer, and Commodity Price Indexes explains how analysts measure different layers of price change. The correct index depends on whose transactions are measured, which items are covered, how weights are updated, and what decision the result will support.
This branch distinguishes the index level from its rate of change and separates consumer prices, producer selling prices, raw-material benchmarks, and specialized national measures.
| Page | Start here when you need to understand |
|---|---|
| Price Index | Base periods, basket weights, index formulas, rebasing, and how to calculate a percentage change |
| Price Level | Why an index level differs from inflation, disinflation, deflation, and relative-price changes |
| Consumer Price Index | Price change experienced by a defined consumer population, including U.S. CPI-U, CPI-W, and C-CPI-U |
| PCE Price Index | U.S. consumption prices within the national accounts, including spending on behalf of households and Fisher chain weighting |
| Producer Price Index | Selling prices received by producers, final versus intermediate demand, margin context, and contract escalation |
| Commodity Price Index | Weighted raw-material benchmark prices, index concentration, currency effects, and spot-versus-futures distinctions |
| RPIX | The UK Retail Prices Index excluding mortgage interest payments and its differences from RPI, CPI, and CPIH |
| Measurement layer | Example | What it does not directly measure |
|---|---|---|
| Consumer transactions | CPI or PCE price index | Producer margins, securities prices, or every household’s personal basket |
| Producer transactions | PPI | Retail consumer prices or one company’s complete cost structure |
| Raw-material benchmarks | Commodity price index | Labor, rent, retail services, taxes, or final delivered costs |
| Domestic final output | GDP deflator | Imported goods directly or only household consumption |
| Legacy specialized framework | RPIX | UK CPI, CPIH, or a borrower’s actual mortgage payment |
An index is evidence about its defined transaction set. It is not a general-purpose inflation number that can be substituted into any contract, valuation, wage comparison, or household budget.
Before using a published rate, identify:
This prevents common errors such as comparing a monthly core CPI change with a 12-month headline PCE rate or using a broad PPI series to escalate a narrow material contract.
For headline, core, underlying, and cost-of-living distinctions, continue to Headline, Core, and Cost-of-Living Inflation.
These pages provide general financial education. They do not provide an inflation forecast, contract interpretation, or personalized investment, tax, retirement, or household-budget advice.
Choose a subsection first. Deeper term pages live inside each subsection, which keeps large topic hubs readable.
A commodity price index tracks a weighted basket of raw-material benchmark prices; learn how weights, currency, composition, and market conventions affect interpretation.
The Consumer Price Index measures price changes experienced by a defined consumer population; learn CPI calculation, headline and core rates, uses, and limits.
The PCE Price Index measures prices for U.S. personal consumption spending, including purchases made on behalf of households; learn its formula, uses, and CPI differences.
A price index measures how prices for a defined item or basket change relative to a reference period; learn the formula, weighting methods, and limitations.
The price level is the aggregate level of prices represented by a defined price index; learn how it differs from inflation and individual price changes.
The Producer Price Index measures changes in selling prices received by domestic producers; learn final and intermediate demand, business uses, and limitations.
RPIX is the UK Retail Prices Index excluding mortgage interest payments; learn how it differs from RPI, CPI, and CPIH and why the distinction matters.