Common property - A brief review of recent literature.

Summary Common ownership is based on the idea of firms competing in a market with identical owners. It is then a question of studying the consequences in terms of general competition in such a market, knowing that firms can be expected to mitigate competition by producing fewer units, increasing prices, reducing investments, innovating less or limiting entry into new markets. This review is composed of a first section devoted to the origins of thinking on the subject, the second to a description of the rise of common ownership, the third to the paths taken for it to have an influence on firms, the fourth to the characterization of these effects and its criticisms, and the last concludes with the consequences for competition policy.