Competition policy aims to prevent anticompetitive agreements and mergers, limiting the abusive exercise of market power. The formulation and application of this policy presents significant challenges, which include showing that proposed mergers are anticompetitive, proving that firms are...

We examine market structure and optimal commodity taxation in a world in which firms produce differentiated products and can exert some degree of market power. Building on Kay and Keen (1983), we model two forms of product technologies, two forms of market entry structures, and two forms of...

The rise of managed healthcare organizations (MCOs) and the associated increased integration among providers has transformed US healthcare and at the same time raised antitrust concern. This paper examines how competition among MCOs affects the efficiency gains of improved price coordination...