NEW YORK -- A study conducted by Columbia Business School's Prof. Asim Ansari, William T. Dillard Professor of Marketing, Marketing, and Oded Koenigsberg, Barbara and Meyer Feldberg Associate Professor of Business, Marketing, alongside Florian Stahl, Assistant Professor, Department of Business Economics, University of Zurich, creates models that identify and predict how multiple relationships form in social networks. The research was recently featured in the Journal of Marketing Research.