What do we call it when a person or nation can produce a good using fewer resources than other person or nation

Im not too sure but you can use quizlet to answer the following

its called trading partner

after the roman empire fell, some of its cultural achievements lasted for some time and others were lost. lost achievements include architecture , coins, and literacy. however, several things remained, such as the language. people may not have spoken this language in every city, but it influenced the languages they did speak. they also created the julian , which was commonly used until the eighteenth century.

i think it would be reparing roads