Assuming that the U.S. economy is operating at a point on its production possibilities curve, which of the following statements is true?
A. Because the U.S. economy is a very rich one, scarcity is not an economic problem
B. When the U.S. economy uses more of its resources to produce health care services each year, an opportunity to produce alternative goods and services is sacrificed
C. Because the U.S. economy has abundant natural resources, there is not limit to the amount of goods and services that can be produced each year
D. In a given year the opportunity cost of devoting more resources to the national defense is zero
Answer: B