Considering a PPF with health care services on the vertical axis and other goods and services on the horizontal axis, the increasing production of health care services in the United States as a result of the aging population represents (考虑到垂直轴上的医疗保健服务以及其他货物和服务的横向轴线上的PPF ,由于人口老龄化,美国医疗保健服务的增加代表着越来越多的代表——中文由在线翻译而来,仅供参考)
A.
a movement upward along the PPF.沿 PPF 向上运动。
B.
an outward shift of the PPF from the vertical axis. PPF 从垂直轴向外移动。
C.
an outward shift of the PPF from the horizontal axis. PPF 从横轴向外移动。
D.
a movement downward along the PPF.沿 PPF 向下运动。