Suppose the following table shows the production possibilities for an economy.

Production Point Good X Good Y

A 5 10

B 8 5

U 5 5

a. What is the opportunity cost of moving from point A to B?

b. What is the opportunity cost of moving from point B to A?

c. What is the opportunity cost of moving from point U to A?

d. Suppose points A and B are on the production possibility frontier. What conclusion can be drawn about production point U?