Questions: As long as there are differences in opportunity costs, there are advantages and there will be potential for trade to make both parties better off.

The answer is: comparative

Explanation:

1. Comparative advantage refers to the ability of a party to produce a particular good or service at a lower opportunity cost than another. When two parties have different opportunity costs for producing goods, they can benefit from trade by specializing in the production of goods for which they have a comparative advantage.

2. Absolute advantage, on the other hand, refers to the ability of a party to produce more of a good or service with the same amount of resources as another party. However, trade is driven by comparative advantage, not absolute advantage.

3. The concept of comparative advantage is fundamental to the theory of international trade, as it explains how and why trade can be beneficial for all parties involved, even if one party is less efficient in producing all goods.

In summary, as long as there are differences in opportunity costs, there are comparative advantages, and there will be potential for trade to make both parties better off.