Sophisticated firms have learned the marketing lesson that A

Sophisticated firms have learned the marketing lesson that A. it is a lot easier to find new customers than to retain existing ones. B. the buying experience, customer satisfaction, and retention can increase firm profits. C. it is not clear whether it is easier to find new customers or to retain existing ones. D. existing customers do not spend as much as new customers since the initial novelty of the product declines over time. E.unless a marketing promotion to retain customer loyalty can increase market share by at least 5%, it is not worth the expenditure.