Which of the following describes the trade-off visualized in a production possibilities frontier?

The production possibilities frontier (PPF) illustrates the trade-off between two different goods or services that an economy can produce, given a fixed amount of resources. When examining the PPF, the trade-off is depicted by the slope of the curve, showing how much of one good must be forgone to increase the production of another good. This concept effectively communicates the idea of opportunity cost—the value of the next best alternative that is sacrificed when making a decision.

When one moves along the curve, increasing the production of one good requires a decrease in the production of another good. Thus, option B accurately describes this key economic principle as it highlights how the cost of increasing one good is measured in terms of the quantity of another good that must be given up, which is the essence of the trade-off represented in the PPF. This understanding is fundamental in economics as it emphasizes scarce resources and the need for efficient allocation between competing uses.