[FrenchDevRemote]

How do you know they can do the exact same task? After how many months? And what if the new guy quit after a month and after you wasted weeks on trying to hire them?

Value generation should be +/- the only metric for salary(besides whether or not you negatively affect the rest of team because of your behavior)

[nightski]

It’s also very difficult if not impossible to calculate generally and many people tend to vastly overestimate their personal contribution to value generation.