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1 " El valor es la capacidad de satisfacer o rebasar las necesidades de los clientes, y también de hacerlo eficientemente. "
― Michael E. Porter , On Competition
2 " Complements can be important when they affect the overall demand for an industry’s product. However, like government policy, complements are not a sixth force determining industry profitability since the presence of strong complements is not necessarily bad (or good) for industry profitability. Complements affect profitability through the way they influence the five forces. "