Journal of Regional ScienceVolume 30, Issue 2 p. 165-183 PRODUCT VARIETY, MARSHALLIAN EXTERNALITIES, AND CITY SIZES* Hesham Abdel-Rahman, Hesham Abdel-Rahman Assistant Professor, Department of Economics and Finance, University of New Orleans; Professor, Regional Science Department, University of Pennsylvania.Search for more papers by this authorMasahisa Fujita, Masahisa Fujita Assistant Professor, Department of Economics and Finance, University of New Orleans; Professor, Regional Science Department, University of Pennsylvania.Search for more papers by this author Hesham Abdel-Rahman, Hesham Abdel-Rahman Assistant Professor, Department of Economics and Finance, University of New Orleans; Professor, Regional Science Department, University of Pennsylvania.Search for more papers by this authorMasahisa Fujita, Masahisa Fujita Assistant Professor, Department of Economics and Finance, University of New Orleans; Professor, Regional Science Department, University of Pennsylvania.Search for more papers by this author First published: May 1990 https://doi.org/10.1111/j.1467-9787.1990.tb00091.xCitations: 189 * We would like to thank Vernon Henderson and three referees for helpful comments and suggestions on earlier drafts of this paper. This research has been supported by NSF grant SES 85-02886, which is gratefully acknowledged. AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat Citing Literature Volume30, Issue2May 1990Pages 165-183 RelatedInformation