5) An international company is producing $50 widgets at a cost of $50,000 and is selling them for $60,000. If it produces a 51st unit, its total sales will be $62,000 and its total cost will
be $51,500. Should the company produce the 51st unit?

6) Hibw will the following events affect the production possibility frontier of an economy?
Event A: A large fraction of the work force becomes unemployed.
Event B: The productivity of all work force doubles.
Event C: The government requires dairy farmers to destroy part of their herds.