问题详情

假设美国政府能够确知在以后的20年中哪些产业的增长最为迅速，为什么这并不一定意味着美国应该采取政策支持这些产业的增长？
Suppose the U.S. government were able to determine which industries will grow most rapidly over the next 20 years．Why doesn't this automatically mean that the nation should have a policy of supporting these industries' growth？