← Search Econometrica Vol. 27 No. 3 1959 Cahiers de Seminaire d'Econometrie No. 4 Walter D. Fisher; René Roy DOI10.2307/1909484 Volume27 Issue3 Pages506 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 ✓