Base Year
A base year supplies the price weights, reference scale, or comparison benchmark for an index or economic series. See how rebasing works and what it changes.
Base-year and constant-price methods used to compare economic series after removing price-level changes.
Base-Year and Constant-Price Methods explains how economic series establish a comparison scale and separate changes in prices from changes in volume. It sits within Base-Year, Constant-Price, and Deflator Methods.
Start with Base Year to distinguish a fixed weight or price base from an index reference year. That guide also covers rebasing, index normalization, and the former base-year-analysis and base-year-prices labels.
Use Constant Prices for fixed-price calculations, price-index deflation, and the differences between traditional constant-price series and modern chain-linked volume measures.
Before comparing a real series, verify the issuing institution, price or quantity scope, base or reference period, fixed or chain method, frequency, seasonal adjustment, annualization, and revision vintage. A shared reference year does not by itself make two indexes, currencies, or national series comparable.
This material is educational and does not provide investment, accounting, tax, legal, contract, valuation, or statistical-methodology advice.
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A base year supplies the price weights, reference scale, or comparison benchmark for an index or economic series. See how rebasing works and what it changes.
Constant-price measures remove estimated price change so output, spending, or income can be compared in volume terms across periods.