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Definition: Quantity index

OECD - Data and Metadata Reporting

A measure reflecting the average of the proportionate changes in the quantities of a specified set of goods and services between two periods of time. Usually a quantity index is assigned a value of 100 in some selected base period and the values of the index for other periods are intended to indicate the average percentage change in quantities compared with the base period.
ILO, IMF, OECD, UNECE, World Bank, 2004, Producer Price Index Manual: Theory and Practice - Glossary, International Monetary Fund, Washington D.C. [quoted in Organisation for Economic Co-operation and Development (OECD), "Data and Metadata Reporting and Presentation Handbook", OECD, Paris, 2007]