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Industry conditions change

because new industry key success factors emerge.

because of newly$-$emerging industry threats and industry opportunities that alter the composition of the industry's strategic groups.

because important forces in the industry environment are driving certain industry participants $($competitors$,$ customers, suppliers$)$ to alter their actions in important ways. chiefly because of changes in the barriers to entry and the degree of competition from substitute products. 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.

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