Guns and butter are the example of production possibility frontier(PPF)
Explanation:
Production possibility frontier is a graphical presentation that shows two goods combination and shows how these goods would be produced with efficient utilization of resources.
Guns and butter shows a relation in case of production possibility frontier , it shows how the investment should be done with the minimum resources present in the economy. If the economy is having proper resources for the production of guns and butter then 6 units of guns and 12 units of butter can be produced but while taking decision a nation should be rational , that is how to use the resources.