Which of the following is NOT illustrated by the production possibility curve

The production possibility curve illustrates the concept of opportunity cost and scarcity, but does not necessarily illustrate the concept of risk. The production possibility curve shows the trade-off between two goods and the maximum amount of one good that can be produced for every possible level of production of the other good. It demonstrates the idea of opportunity cost, which is the cost of one choice in terms of the best alternative choice. Scarcity is also shown through the production possibility curve, as the curve assumes that resources are limited and that choosing to produce more of one good means producing less of the other. Allocative efficiency is a point on the production possibility curve where the economy is producing at the most efficient level, meaning that the resources are being used in such a way as to produce the maximum amount of both goods. Risk, on the other hand, refers to uncertainty about the outcome of an action or decision and is not necessarily illustrated by the production possibility curve.