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Put it in a different perspective.

If a highly skilled and more valuable employee is making 2x his or her peers then this type of disclosure reduces the companies ability to retain said employee.

For instance, now everyone will demand a raise and the company will potentially have to lay off some employees to ensure a higher salary and same profit.

Alternatively, the most qualified people may leave. There are times where smaller companies may pay much higher for the right people in the right positions.