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Re:Ask HN: How much do you make at Amazon? Here is how much ... by yaks_hairbrush on Friday March 18, 2016 @03:39PM (#11314319)
One mechanism by which it's good for the employer is information asymmetry. The employer knows all of the employees' salaries, but the employee does not have this information.
Re:Ask HN: How much do you make at Amazon? Here is how much ... by nickff on Friday March 18, 2016 @03:44PM (#11314364)
On the other hand, the employee might feel like others are being paid more than them even when it is not the case. The employee may also resent the management's lack of transparency.

I could see it going both ways, and I'm not sure how to figure out what the impact of wage secrecy is.