Template-Type: ReDIF-Paper 1.0 Series: Tinbergen Institute Discussion Papers Creation-Date: 2013-08-08 Number: 13-112/I Author-Name: Boris van Leeuwen Author-Workplace-Name: University of Amsterdam Author-Name: Theo Offerman Author-Workplace-Name: University of Amsterdam Author-Name: Arthur Schram Author-Workplace-Name: University of Amsterdam Title: Superstars need Social Benefits: An Experiment on Network Formation Abstract: We investigate contributions to the provision of public goods on a network when efficient provision requires the formation of a star network. We provide a theoretical analysis and study behavior in a controlled laboratory experiment. In a 2x2 design, we examine the effects of group size and the presence of (social) benefits for incoming links. We find that social benefits are highly important. They facilitate convergence to equilibrium networks and enhance the stability and efficiency of the outcome. Moreover, in large groups social benefits encourage the formation of superstars: star networks in which the core contributes more than expected in the stage-game equilibrium. We show that this result is predicted by a repeated game equilibrium. Classification-JEL: C91, D85, H41 Keywords: Network formation, networked public goods, peer production, social benefits, open source software File-Url: https://papers.tinbergen.nl/13112.pdf File-Format: application/pdf File-Size: 2131461 bytes Handle: RePEc:tin:wpaper:20130112