The main difference between perfect competition and imperfect competition involves
a. types of consumers
b. control over price
c. the structure of the company

The main difference between perfect competition and imperfect competition involves control over price. The answer is letter B. A perfect competition is where the producers that does not influence the price of the commodity and there are a large number of suppliers and consumers. This is the opposite for imperfect competition.

answer; ///(d); determining who competes most closely   with whom evaluating whether industry driving forces and competitive pressure favor some strategic groups and hurt others, and ascertaining whether the profit potential of different strategic groups varies due to the strengths and weaknesses in each groups respective market positions;

answer; someone must cover the cost associated with the provision of scarce goods in both sectors;