If you and your neighbor both grow oranges and grapefruits and you are better than your neighbor at picking both oranges and grapefruits, there can be no advantage to you in specializing in growing only one type of fruit and trading with your neighbor for the other.

Advantage  means that an individual will produce more of a good or service than competitors using the same amount of resources. In this situation the advantage is that you will grow more oranges or grapefruits than your neighbors. It is false that if you and your neighbor both grow oranges and grapefruits and you are better than your neighbor at picking both oranges and grapefruits, there can be no advantage to you in specializing in growing only one type of fruit and trading with your neighbor for the other. 

Setiap tindakan memiliki reaksi. ucapan itu ditulis oleh newton. itulah hukum ketiga-nya.