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An industry composed of 40 firms, none of which has more than 3 percent of the total market for a differentiated product, can best be described as O a. competitive monopoly . O b. perfect competition . O c. an oligopoly . O d. monopolistic competition. BGF Corporation buys $100 000 of sand, rock, and cement to produce ready-to-mix concrete. It sells 10 000 cubic meters of concrete at $30 per cubic meter. The value added by BGF Corporation is Ra. $200 000. O b. $100 000 . O c. $500 000 . O d. $300 000 Assuming that the total population is 100 million, the labour force is 50 million, and 3 million workers in the labour force unemployed, the unemployment rate O a. is 9 percent . O b. is 6 percent. O c. is 12 percent. 3 O d. is 3 percent