Submission # 13773 Are Capability-based Theories of Firm Boundaries Really Distinct from Transaction Cost Theory? January 2007 Nicholas Argyres School of Management Boston University 595 Commonwealth Ave. Boston, MA 02215 Phone: (617) 353-4152 Fax: (617) 353-5003 nargyres@bu.edu and Todd Zenger John M. Olin School of Business Washington University One Brookings Drive St. Louis, MO 63130-4899 Phone: (314) 935-6399 Fax: (314) 935-6359 zenger@wustl.edu