← Search Econometrica Vol. 31 No. 4 1963 Forms of Engel Functions C. E. V. Leser DOI10.2307/1909167 Volume31 Issue4 Pages694 Sources semanticscholar openalex crossref Cite APA 7 MLA 9 Chicago (author–date) Harvard Elsevier Harvard (JFE, JBF…) The Accounting Review Academy of Management American Marketing Association INFORMS (Management Science) Copy citation Copied ✓