"All of these (and more) are genuine reasons why we might *** think *** we deserve more
Doesn't matter what we think, never has. Can you persuade the people who've assigned this value to yourself that they are wrong.
The problem with going down the parity route is it works both ways. Employer's will put a ceiling on your salary because you are as valuable as person/role X.
All it does is level people. Go down this route and managem,ent come back with this one.
Well we'd like to pay your more, but if we did we'd have to raise the alary of every one above you...
Parity is a prime argument used by unions, pretty much all you need to know about it.
Why should you give a crap if someone thinks they should be paid as much as you? Tell them to get off their arse and earn it, not ride on the coat tails of your effort.
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