Market Power and Informational Efficiency
Jaromir Nosal and
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Savitar Sundaresan: Columbia University
No 356, 2017 Meeting Papers from Society for Economic Dynamics
Levels and concentration of institutional equity ownership have been growing steadily over the last few decades raising concerns of potential market insta- bility. We study theoretically and empirically the consequences of changes in ownership structure for informational content of prices, on average and across assets with di↵erent characteristics. Our theoretical framework is a general equilibrium portfolio-choice model with endogenous information acquisition and market power. We show that, in the cross section, an increase in institutional (informed) ownership increases price informativeness, and an increase in con- centration of ownership leads to lower informativeness. We confirm similar e↵ects in the data of U.S. stocks over the period 1980-2015. The policy ex- periments of changing ownership structure indicate a non-monotonic relation between the levels and concentration of ownership and price informativeness. We conclude that any policy targeting ownership structure should factor in its e↵ects on welfare through price informativeness.
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