Marginal analysis holds that when all externalities have been internalized, the marginal social cost of every good (or bad) equals its marginal social benefit. Such a situation is sometimes referred to as a Kaldor-Hicks social optimum. | Marginal analysis holds that when all externalities have been internalized, the marginal social cost of every good (or bad) equals its marginal social benefit. Such a situation is sometimes referred to as a Kaldor-Hicks social optimum. |