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Are managers embarassed by their people skills?

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Isabel Nicholson posted an interesting point on this story:
https://www.trainingzone.co.uk/item/85457
She suggested that some managers won't pay to train subordinates in people skills, because they are afraid that trainees will learn to cut a better deal at work and / or outshine them. Does anyone know of any research or material on this?
Have you had experience of it?
Ben Hawes