Investment Externalities and a Corrective Subsidy

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Abstract

The paper proposes an intertemporal equilibrium model that highlights the interdependence between aggregate investment and the degree of product differentiation with free entry of monopolistic producers. An investment externality is identified that results in underaccumulation of capital in the decentralized market equilibrium. Some form of investment promotion is called for. The paper compares the effectiveness of a general investment tax credit and an ad valorem output subsidy with policies that favor smaller business size. It is also shown that the complementarity among individual investments creates a potentially powerful investment multiplier.

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