This paper identifies substantial flaws in how U.S. government agencies and courts assess the impact of proposed mergers by firms using broadband networks to reach consumers. Based on current market definitions, consumer impact assessments and economic doctrine, antitrust enforcement agencies...

This paper studies shopping hour decisions by retail chains and independent competitors. We use a Salop-type model where retailers compete in prices and shopping hours. Our results depend significantly on efficiency differences between retail chain and independent retailer. If the efficiency...

We extend the analysis carried out by Valletti (2000) by considering an environmental externality in a vertically differentiated duopoly where firms compete à la Cournot with fixed costs of quality improvement.We show that, if the weight of the external effect is high enough, the resulting...

We examine incentives of bottleneck facility holders to manipulate access charge accounting in free entry downstream markets. We consider the situation wherein one firm holds an upstream bottleneck facility and new entrants use it at the regulated price (access fee) to provide final products....

We propose a theory of 'regulatory endogenous sunk costs' (RESC), in which a captured regulator raises minimum quality standards when market size increases in order to protect incumbent firms. Our RESC theory's predictions that market size is unrelated to industry concentration and positively...