The answer is Abraham Lincoln
Comparative advantage. It is being able to produce goods by using fewer resources, at a lower opportunity cost, that gives countries a comparative advantage. The gradient of a PPF reflects the opportunity cost of production. Increasing the production of one good means that less of another can be produced.
I thinks the Americans should know who their first president is and they also need to know their a pledge a legion to the flag. Oh I was asked who the 14 th president of the United States was when becoming an American citizen for the test.
The County unit system. See the link below that will take you to that.
