When the price of a CD is $13 per CD, 39,000,000 CDs per year are supplied. When the price is $15 per CD, 41,000,000 CDs per year are supplied. What is the elasticity of supply for CDs?

If the aggregate price level ________, but nominal wages stay fixed, real wages ________

A) falls; fall B) rises; fall C) rises; remain fixed D) falls; remain fixed

You and your roommate must divide the cooking and cleaning duties. Which of the following will contribute toward giving you a comparative advantage in cleaning?

A) You develop a contagious disease. B) Your roommate develops an allergy to dust. C) Your roommate takes a course in cooking. D) All of the above. E) None of the above.