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Journal Article Non-Linear Estimates of the Engel Curves Get access S. J. Prais S. J. Prais Cambridge Search for other works by this author on: Oxford Academic Google Scholar The Review of Economic Studies, Volume 20, Issue 2, 1952, Pages 87–104, https://doi.org/10.2307/2295843 Published: 01 January 1952
S. J. Prais (1952) studied this question.