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Journal Article Additive Utility Functions and Linear Engel Curves Get access Robert A. Pollak Robert A. Pollak University of Pennsylvania Search for other works by this author on: Oxford Academic Google Scholar The Review of Economic Studies, Volume 38, Issue 4, October 1971, Pages 401–414, https://doi.org/10.2307/2296686 Published: 01 October 1971
Robert A. Pollak (Fri,) studied this question.