"The most important thing in communication is hearing what isn't said."
"There are only two things in a business that make money - innovation and marketing, everything else is cost."
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Source: Peter F. Drucker (2014). “The Peter Drucker Collection on Managing in Turbulent Times: Management: Revised Edition, Management Challenges for the 21st Century, Managing in Turbulent Times, and The Practice of Management”, p.40, Harper Collins
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