Existence of Marginal Pricing Equilibria in Economies with Externalities and Non Convexities.

We consider a general equilibrium model with a production sector. The consumption sets, the preferences of the consumers and the production possibilities are represented by set-valued mappings to take into account the possibility of external effects. There are no convexity assumptions on the correspondences of production. We impose to the firms to follow the marginal cost tarification which is defined with the Clarke's normal cone. We prove the existence of general equilibria under assumptions which allows us to combine works on economies with externalities and convex production sectors, and the ones on economies with marginal cost tarification and without externalities.