← Search Journal of Political Economy Vol. 72 No. 4 1964 The Role of Entry in Oligopoly Theory Dale K. Osborne DOI10.1086/258919 Volume72 Issue4 Pages396-402 Languageen 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 ✓