Knittel, Christopher R.; Stango, Victor - In: American Economic Review 93 (2003) 5, pp. 1703-1729
We test whether a nonbinding price ceiling may serve as a focal point for tacit collusion, using data from the credit card market during the 1980's. Our empirical model can distinguish instances when firms match a binding ceiling from instances when firms tacitly collude at a nonbinding ceiling....