Which statement describes what a move along the production possibilities frontier represents?

• A. A move along the frontier shows the trade-offs.
• B. An outward shift of the frontier due to growth.
• C. A change in technology.
• D. It shows the trade-offs between two goods, where more of one requires sacrificing some of the other.

Answer: (D)

Moving along the production possibilities frontier shows how resources are used efficiently to produce two goods. Because resources are fixed, increasing the output of one good means giving up some output of the other; this is the trade-off or opportunity cost of the choice. That’s why describing the trade-offs between two goods, where more of one requires sacrificing some of the other, is the best fit. An outward shift or a technology change would move the frontier itself, not just move a point along it, signaling growth or new production possibilities rather than a reallocation of existing resources.