We present a simple model of common ownership in which an investor chooses its stake in competing firms in light of the effects on firm behavior and firm profits. Two firms compete in Cournot duopoly, and ownership affects a firm’s objective function in the manner posited by Bresnahan & Salop...

Although empirical studies show that common shareholding affects corporate conduct and that common horizontal shareholding lessens competition, critics have argued that the law should not take any action until we have clearer proof on the causal mechanisms. I show that we actually have ample...

Horizontal shareholding exists when significant shareholders have stock in horizontal competitors. (It is often imprecisely called "common shareholding," but that term can also apply when shareholders own stock in two noncompeting corporations. It differs from "cross-shareholding," which...

Empirical evidence that horizontal shareholding has created anticompetitive effects in airline and banking markets have produced calls for antitrust enforcement. In response, others have critiqued the airline and banking studies and argued that antitrust law cannot tackle any anticompetitive...

This Article shows that new economic proofs and empirical evidence provide powerful confirmation that, even when horizontal shareholders individually have minority stakes, horizontal shareholding in concentrated markets often has anticompetitive effects. The new economic proofs show that,...

There are very few industries that can attract the attention of Congress, multiple federal and state agencies, consumer groups, economists, antitrust lawyers, the business community, farmers, ranchers, and academics as the agriculture workshops have. Of course, with intense interest from...

This comment was filed with the Department of Justice Antitrust Division on December 31, 2009, as "Comments Regarding Agriculture and Antitrust Enforcement Issues in Our 21st Century Economy" in response to the DOJ/USDA request for public comments for the agencies' joint workshops on antitrust...

Is common ownership in fintech companies an empirically significant phenomenon? What are its impact on competition and innovation in fintech markets and its implications for competition law enforcement? This chapter studies these questions providing evidence and insights on the extent of common...

This paper investigates the price war in the UK quality newspaper industry in the 1990s. We build a model of the newspaper market which encompasses demand for differentiated products on both, the readers and advertisers side of the market, and profit maximization by four competing oligopolistic...

Many online businesses, including most of the largest platforms, seek and provide attention. These online attention rivals provide products and features to obtain the attention of consumers and sell some of that attention, through other products and services, to merchants, developers and others...