We develop an equilibrium model of industrial structure in which the organization of firms is endogenous. Differentiated consumer products can be produced either by vertically integrated firms or by pairs of specialized companies. Production of each variety of consumer good requires a unique,...

The paper generalizes Blackwell's theorem, according to which the welfare effects of an improvement in information are positive to certain class equilibrium production economies. The consumer preferences in this class of economies exhibit either constant relative risk of constant risk aversion...