The measles vaccine provides both private benefits to individuals and positive external benefits to other members of society. As a result, without government intervention: O too many doses of the vaccine would be produced, since its external benefits would not be considered. too few doses of the vaccine would be produced, since its external benefits would not be considered. the optimal amount of the vaccine would be produced, since its external benefits would not be considered. too few doses of the vaccine would be produced, since its marginal social benefits would be overstated