← Search Econometrica Vol. 39 No. 4 1971 Econometrics of International Trade Volume39 Issue4 Pages146-149 Sources bibtex:phds-export.bib 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 ✓