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The positive impacts vary from firm to firm and the amount of impact each firm has is relative. In short, overall improvements have been witnessed in Organizations. To get a detailed analysis, you can look at this paper that answers your specific questions.Of special interest will be pages8-10 that discuss the key findings of the paper!
Link http://www.mbsportal.bl.uk/taster/subjareas/hrmemplyrelat/cmi/131646businessbenefitsMLD_12.pdf