There are two very different sources of market power in antitrust cases. The first is traditional market sharebased market power. Market power in antitrust cases also can come from deception, significantly imperfect or asymmetric information, or other types of market failures that usually are...

This article seeks an answer to a question that should be well settled: for purposes of antitrust analysis, what is 'market power' and/or 'monopoly power'? The question should be well settled because antitrust law requires proof of actual or likely market power or monopoly power to establish...

The conventional antitrust wisdom is that buyer side market power or monopsony is so unusual and so rarely anticompetitive that it should not merit more than a scholarly afterthought. Moreover, these brief mentions typically say it is essentially the mirror image of seller power or that, while...