Take aside legal aspects, why wouldn't any employee share their salary with their peers? If your salary is lower than average, it may cause coworkers to at lea

Take aside legal aspects, why wouldn't any employee share their salary with their peers? If your salary is lower than average, it may cause coworkers to at least subconsciously believe that you're a weak performer. If it's higher than average, it can cause resentment among others who think that they're as good or better than you. Plus, it opens the door to being classified as wasteful or cheap if your perceived spending patterns don't seem to match your salary. The best way to do something like this is to anonymize individuals and publish averages.