What does the slope of a production possibilities frontier represent?

• A. The level of government spending.
• B. The inflation rate.
• C. The trade-off of producing more of one good in terms of the other.
• D. The money supply.

Answer: (C)

The slope shows the trade-off you face when reallocating resources between two goods. It tells how much of one good must be given up to produce one more unit of the other—this is the opportunity cost, or the marginal rate of transformation between the two goods. A steeper slope means a higher opportunity cost, since more of the other good must be sacrificed for each additional unit of the first. If the curve is straight, the opportunity cost is constant; if it’s curved, the cost changes as you move along the frontier.

So the surface-level takeaway is that the slope quantifies the per-unit sacrifice of the other good when increasing production of one good. The other options describe macro indicators not related to the production trade-off on the frontier.