Utopia doctors immunize children against measles, a highly contagious and potentially deadly virus. The demand and supply curves for the immunization are given by the following equations. Demand: Q = 200 P thousand immunizations per year Supply: Q = 6.5P 15 thousand immunizations per year but the social marginal benet (SM B) is given by the following equation Q = 200 0.2 x SM B thousand immunizations per year and the private marginal cost and social marginal cost are identical