1. Can two countries always gain from
trade with each other?

The gains from trade are obvious when one country is better at producing one good and its trading partner is better at producing another. It is less obvious, but also true, that if one country is better at producing everything, then both countries can still gain from trade.

Explanation:

a because i tried to vote with just my college id and the answer was no

a variant spelling of the word dote (british)