EXPLORING THE CONTRIBUTIONS OF HUMAN AND SOCIAL CAPITAL TO PRODUCTIVITY Arent Greve Department of Strategy and Management The Norwegian School of Economics and Business Administration Bergen, Norway Tel. int-47-55 959453, or 416-533 8313 arent.greve@nhh.no Mario Benassi Department of Informatics and Communication University of Milan, Italy mbenassi@dico.unimi.it Arne Dag Sti Department of Economics Agder University College Kristiansand, Norway arne.d.sti@hia.no 13/11/2006 A revised version of a paper presented at SUNBELT XXVI, Vancouver, BC, April 25-30, 2006. Keywords: Social capital, Human capital, Network organizations, Productivity, Knowledge Ma- nagement, Organizational Memory, and Organizational Learning.