We run a computerised experiment of network formation where allconnections are bene…cial and only direct links are costly. Players simul-taneously submit link proposals; a connection is made only when bothplayers involved agree. We use both simulated and experimentally gen-erated data to test...

In this paper, we study a voluntary contribution mechanism withone-way communication. The relevance of one person’s words is assessedby assigning exogeniously the role of the ‘communicator’ to onegroup member. Contrary to the view that the mutual exchange ofpromises is necessary for the...