← Search Econometrica Vol. 7 No. 3 1939 Periodicity as an Explanation of Variation in Hog Production P. D. Bradley; W. L. Crum DOI10.2307/1907157 Volume7 Issue3 Pages221 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 ✓