Wireless number portability (WNP) is a telecommunication regulatory policy that requires cellular phone service providers to allow customers who switch service subscriptions to retain their original phone numbers. The right to retain the number lowers the switching cost for a consumer. Thus, the...

John Sutton's (1991) widely acclaimed book on sunk costs and market structure contains several robust predictions. The authors' empirical results across exogenous and endogenous sunk cost markets support most of Sutton's robust predictions. Exogenous sunk cost markets have lower minimum values...