This work is distributed as a Discussion Paper by the STANFORD INSTITUTE FOR ECONOMIC POLICY RESEARCH SIEPR Discussion Paper No 03 Confusing Success with Access Correctly"Measuring Concentration of Ownership and Control in Mass media and online services PREPARED FOR "MEDIA CONCENTRATION AND THE INTERNET- EMPIRICAL BUSINESS AND POLICY RESEARCH. A SYMPOSIUM AT THE COLUMBIA INSTITUTE FOR TELE-INFORMATION (CITD), COLUMBIA BUSINESS SCHOOL, APRIL 15TH, 2004 Bruce M. Owen May 2004 Discussion Draft-Please do not quote without permission Stanford Institute for Economic Policy Research Stanford University Stanford CA 94305-60151 This work is distributed as a Discussion Paper by the STANFORD INSTITUTE FOR ECONOMIC POLICY RESEARCH SIEPR Discussion Paper No. 03- Confusing Success with Access: “Correctly” Measuring Concentration of Ownership and Control in Mass Media and Online Services PREPARED FOR “MEDIA CONCENTRATION AND THE INTERNET – EMPIRICAL, BUSINESS AND POLICY RESEARCH,” A SYMPOSIUM AT THE COLUMBIA INSTITUTE FOR TELE-INFORMATION (CITI), COLUMBIA BUSINESS SCHOOL, APRIL 15TH, 2004 Bruce M. Owen May 2004 Discussion Draft—Please do not quote without permission. Stanford Institute for Economic Policy Research Stanford University Stanford CA 94305-6015