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Your earning ability today is largely dependent upon your knowledge, skill and your ability to combine that knowledge and skill in such a way that you contribute value for which customers are going to pay.

Brian Tracy (2013). “Earn What You're Really Worth: Maximize Your Income at Any Time in Any Market”, p.39, Vanguard Press
Your earning ability today is largely dependent upon your knowledge, skill and your ability to combine that knowledge and skill in such a way that you contribute value for which customers are going to pay.