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" "Marketing, and the whole firm, should devote extraordinary endeavour towards delighting, keeping for ever and expanding the sales to the 20 per cent of customers who provide 80 per cent.
Richard John Koch (born July 28, 1950) is a British author, speaker, investor, former management consultant, and entrepreneur. He has written more than 20 books on business and ideas including The 80/20 Principle which discussed applying the Pareto principle in management and life.
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