From a social viewpoint,when price = marginal cost:

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When price equals marginal cost, economic efficiency is attained as a whole. This is because in this situation, resources are allocated in the most efficient manner possible and there is no deadweight loss. Any increase or decrease in production would lead to a loss of economic efficiency. Therefore, the economy as a whole would not be better off with either more or less production, and firms would not be better off by producing less. Consumers would also not be better off by consuming less as they are already paying the lowest possible price.

From a Social Viewpoint,when Price = Marginal Cost