A question the answer to which depends on a choice of weights. E.g., the effect of trade on the real wage of labor in the specific factors model is an index number problem, depending on how much workers consume of (lower-priced) imported and (higher-priced) exported goods.

Related information about index number problem:

1. OECD Glossary of Statistical Terms - Index number problem Definition
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2. Index (economics) - Wikipedia, the free encyclopedia
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   Mr. Lockyer meets the Index Number Problem: the standard of living in Canton and London in 1704. By. Robert C. Allen. Professor of Economic History. Nuffield ...
    
5. 15. Basic Index Number Theory - IMF
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6. Some Observations on the Index Number Problem - JStor
   from the investigation of the index number problem in that context are relevant to many other studies which make use of index number estimation. The estimate ...
    
7. Afriat's Theorem and the Index Number Problem by S. N. Afriat :: SSRN
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8. 'Index Number Problem' and Poverty Monitoring - Sanjay G. Reddy
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