← Search Econometrica Vol. 36 No. 3/4 1968 Short-Run Employment Variation on Class-I Railroads in the U.S., 1947-1963 Sherwin Rosen DOI10.2307/1909520 Volume36 Issue3/4 Pages511 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 ✓