4 (1 point) When a country's production possibilities frontier shifts outward over time, the country is experiencing Question 4 options: A) an end to opportunity cost. B) economic growth. C) a decrease in unemployment of resources. D) no opportunity cost. Question 5 (1 point) If Wendy can produce more of all goods than Tommy in an hour, then Question 5 options: A) Wendy does not need to trade with Tommy in order to achieve the gains from trade. B) Wendy has a comparative advantage in all goods. C) Wendy has an absolute advantage in all goods. D) Only Tommy but not Wendy can benefit from trade between the two of them. Question 6 (1 point) The sustained expansion of production possibilities is called Question 6 options: A) economic investment. B) economic growth. C) opportunity cost of growth. D) production possibilities