← Search American Economic Review Vol. 80 No. 5 1990 Horizontal Mergers: The 50-Percent Benchmark Dan Levin Volume80 Issue5 Pages1238-1245 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 ✓