CBI CENTER FOR BUSINESS INNOVATION Center for Business Innovation Chalmers University of Technology Vera Sandbergs Allé 8 SE-412 96, Göteborg, Sweden www.cbi.chalmers.se WORKING PAPER SERIES Center for Business Innovation Working Paper Series No. 8 Heterogeneity and Performance in Innovation Idea Networks Jennie Björk and Mats Magnusson July, 2008