Real GDP per person tells us the income and expenditure of the average person in the economy

Which of the following statements is true?

A) The production possibilities curve of a nation is fixed in the long run. B) The production possibilities curve can only shift to the right. C) The production possibilities curve of an economy is concave to the origin. D) The slope of the production possibilities curve represents the ratio of the marginal cost of producing goods.

Describe some of the external benefits associated with education. What can government do to encourage production of the efficient amount of education?

What will be an ideal response?