Which of the following institutions form the private sector in an economy?

One difficulty in achieving international coordination is that

A) central banks often must compromise for the good of both nations. B) one nation is always made worse off. C) monetary union is required. D) sterilization is often politically unpopular.

When social costs of an activity exceed private costs

A) there is a tendency for resources to be under-utilized. B) this means that resources are being efficiently used. C) there is a tendency for resources to be over-utilized. D) None of the above is correct.