The supply of measels vaccines is given by Q=450*P. The demand for measles vaccine is given Q=20,000-50*P. A. what is the market equilibriumprice and quanity? B. The demand curve implies that private willingness to pay is P=400-Q/50. However ecternal benefits are associated with each measles vaccination, so the social deman curve is Q=20,000-50*(P-5). What are the equilibrium price and quanitiy if these external bebenfits are considered? C. Propose an intervention that will result in this equilibrium volume.