Competition law's vertical agreement requirement is widely regarded to be perplexing and to offer a fairly limited unilateral action defense. These views prove to be understated. The underlying distinction is incoherent on a number of levels and difficult to reconcile with pertinent statutes,...

"Optimal policy rules--including those regarding income taxation, commodity taxation, public goods, and externalities--are typically derived in models with homogeneous preferences. This article reconsiders many central results for the case in which preferences for commodities, public goods, and...