← Search The Review of Economics and Statistics Vol. 31 No. 3 1949 Comments Fritz Machlup DOI10.2307/1927744 Volume31 Issue3 Pages210 Sources openalex semanticscholar 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 ✓