Industry conditions change A. because of newly emerging industry threats and industry opportunities that alter the composition of the industry's strategic groups. B. because new industry key success factors emerge. C. because of such powerful driving forces as swings in buyer demand, changing interest rates, ups and downs in the economy, and higher/lower entry barriers. D. chiefly because of changes in the barriers to entry and the degree of competition from substitute products. E. because forces create pressures or incentives for industry participants (competitors, customers, suppliers) to alter their actions in important ways.