Which concept explains how two regions can benefit from trading a good they do not produce efficiently?

• A. Comparative Advantage
• B. Complementarity
• C. Absolute Advantage
• D. Specialization

Answer: (B)

Complementarity is the idea that two regions gain from trade because what one region produces well fits a demand the other region has, especially for a good that isn’t produced efficiently in one place. When a region isn’t efficient at producing a particular good, it can still benefit by exchanging with another region that can produce that good more cheaply or effectively. Through trade, each region specializes in goods that align with its strengths and needs, so both end up with access to a broader mix of goods at a lower overall cost.

This view highlights how the match between what each region has to offer and what the other region wants creates mutual benefits. It differs from comparing costs (comparative advantage), overall production pace (absolute advantage), or the broader process of focusing production on specific outputs (specialization).