← Search Econometrica Vol. 17 1949 Optimum Utilization of the Transportation System Tjalling C. Koopmans DOI10.2307/1907301 Volume17 Pages136 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 ✓