Abstract
A stylized fact that lurks in the background of the recent literature on common ownership is the parallel increase in the profitability of oligopolistic industries and common ownership. Some have argued that the growth in common ownership has caused the increase in oligopoly profits and have proposed a variety of policy responses. This paper briefly reviews the available evidence and finds it unconvincing. It then provides an overview of the evidence that concentration and profitability have increased, considers alternative explanations, and suggests that the emergence of “superstar” firms – and not the growth in common ownership – could be a fundamental driver of the parallel increase in concentration and profitability.
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