5. (9 points) Consider the Airbus-Boeing model discussed in class. (a) (3 points) Is there any welfare loss analogous to the deadweight loss in this model? (b) (3 points) What would happen to welfare in the two countries if the United States were to retaliate against European Union subsidies by offering a subsidy of its own? (c) (3 points) Given your answer to part (b), explain the motivation for the Untied States and the European Union to sign their 1992 trade agreement on large aircraft