e?  A. the firm produces based on the private marginal benefit and private marginal cost B. the welfare of the society is maximized if the sum of the private and social marginal benefits is equated with the sum of the private and social marginal costs C. there is an overproduction of goods with negative externality or an underproduction of goods with positive externality because the social costs and social benefits are not considered in the production decisions of the firm D. all are true E. none is true

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