The leаder оf а federаl pоlitical party made the fоllowing campaign promise: "My administration will increase national defense without requiring sacrifices elsewhere in the economy." The promise can be kept if: the economy moves along the production possibilities in the direction of a greater quantity of defense. the economy moves from a point inside the production possibilities curve toward a point on the production possibilities curve. the production possibilities frontier shifts outward due to an improvement in technology. either b) or c) occurs, but not as a result of a).