Answer:
New England produces milk and the Middle Colonies manufactures barley.
Step-by-step explanation:
Using the principle of Comparative advantage (which is an economic expression that refers to an economy's capability to manufacture goods and services at a lesser opportunity cost than that of its trade partners.) when theirs is a comparative advantage, companies will now have the ability to sell goods and services at a lower price than its rival companies and also realize stronger sales margins.
So in using this principle, New England produces milk and the Middle Colonies produce barley.