The flow of resources across sectors to their best use, with concomitant entry and exit, is central to the functioning and welfare properties of a market economy. Nevertheless, most industrial organization research, including applications to competition policy, undertakes partial equilibrium...

Market definition has long held a central place in competition law. This entry surveys recent analytical work that has called the market definition paradigm into question on a number of fronts: whether the process is feasible, whether market share threshold tests are coherent, whether the...

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,...

The flow of resources across sectors to their best use, with concomitant entry and exit, is central to the functioning and welfare properties of a market economy. Nevertheless, most industrial organization research, including applications to competition policy, undertakes partial equilibrium...

This article explores the many ways that entry is relevant to horizontal merger analysis.Only one, however, is part of the current canon, and it is handled incorrectly. The analysisdraws on work in industrial organization economics that examines entry in imperfectlycompetitive markets. Ex post...

The market definition/market share paradigm, under which a relevant market is defined and pertinent market shares therein examined in order to make inferences about market power, dominates competition law. This Article advances the immodest claim that the market definition process is incoherent...