Bavarian Crystal Works designs moreover manufactures lead crystal wine decanters for export to international marketplaces. The production manager of Bavarian Crystal Works estimates total and marginal production costs to be TC = 10,000 + 40Q + 0.0025Q2 and MC = 40 + 0.005Q where costs are measured in U. S. dollars in addition to Q is the number of wine decanters produced annually. As Bavarian Crystal Works is only one for many crystal producers in the world market, it can wholesale as many of the decanters as it wishes for $50 apiece. Total and marginal revenue are

TR = 50Q and MR = 50 where revenues are measured in U. S. dollars as well as Q is yearly decanter manufacture.