If someone is relatively better at producing one product compared to another, they possess a(n) _____ advantage.

The correct term for when someone is relatively better at producing one product compared to another is "comparative advantage." This concept is fundamental in economics and refers to the ability of an individual, firm, or country to produce a good or service at a lower opportunity cost than others.

When someone has a comparative advantage, it means they can produce a specific product more efficiently in terms of resource allocation than their alternatives. This principle helps explain how trade can be beneficial for parties involved, as they can specialize in the production of goods for which they have a comparative advantage and then trade for other products, leading to an overall increase in efficiency and welfare.

In contrast, "absolute advantage" refers to the ability to produce a greater quantity of a good or service than another party without regard to the opportunity cost. "Average" and "productive" do not relate to the economic concept in question and are not used to describe the efficiency of production in terms of relative opportunity costs.