It is estimated that companies in the U.S. spent $800 million in 1998 to quot;acquire talent -- entertainers, athletes and other high profile personalities -- to spotlight in advertising, promotion and PR campaignsquot; (IEG Endorsement Insider). Such ads appear in a variety of media. How do we...

We analyze a model in which agents have to make a binary choice under incomplete information about the state of the world, but also care about coordination with other agents who have the same problem. In some of these situations, the larger the share choosing the same alternative, the better off...