Demonstrating how an economic variable changes from one year to the next is best illustrated by a

The U.S. tariff on paper ____ the U.S. price of paper, _____ U.S. production of paper and _______the U.S. gains from trade

A. raises; increases; increases B. doesn't change; increases; increases C. doesn't change; doesn't change; decreases D. raises; increases; decreases

The above figure shows the long-run expansion path. The long-run average cost curve will be

A) horizontal. B) downward sloping. C) upward sloping. D) vertical.