National defense is an example of a ________

A movement along the demand curve shows a change in demand

Indicate whether the statement is true or false

The production possibilities curve illustrates: a. the minimum quantity of two resources necessary to produce a given level of output

b. that when resources are currently being used inefficiently, it is possible to increase production of one good only by sacrificing some of another good. c. that when resources are currently being used efficiently, it is possible to increase production of one good only by sacrificing some of another good. d. the minimum quantities of output that can be produced using available resources.