Marginal costs. Keep in mind that marginal means on the edge of something, so the cost of producing one more unit would be on the edge. Hope this explanation helps.
Answer:
Most of the fighting during the American Civil War took place on Southern soil. In part, this was the result of the war strategies of both sides. To win the war, the South had only to survive. On the other hand, for the North to win, the Union had to be restored.
