The solution is for the manager to sit down with A and tell him to stop being a brat.
No, seriously. If A is getting upset because he feels he's not paid "fairly", but A isn't contributing enough to get paid more, then someone needs to tell A exactly why he's being paid less. And if you can't explain why, then you need to reconsider that decision very, very carefully.
No, seriously. If A is getting upset because he feels he's not paid "fairly", but A isn't contributing enough to get paid more, then someone needs to tell A exactly why he's being paid less. And if you can't explain why, then you need to reconsider that decision very, very carefully.