The United States can use all its resources to produce 250 DVDs or 500 shoes. China can use all of its resources to produce 30 DVDs or 300 shoes. The opportunity cost of producing a DVD in the United States is
选项:
A: 2 shoes.
B: 1/2 of a shoe.
C: 20 shoes.
D: 500 shoes.
发布时间:2024-04-06 23:52:26