When I joined the company I work for 7 years ago, I asked for a particular salary. Turns out it was more than my peers already in the company who had more knowledge etc. My counterpart complained and got her salary matched to mine. I was oblivious to this at the time and it was clear I was resented by some of the team (those who had been there longer). Once colleague who had worked up from the lowest paid role in the company was horribly underpaid compared to the rest of us (and probably still is)
in the last 7 years my salary has barely risen. (Probably around 4.5% in total).
The company has taken on new staff: at a salary of almost twice what some of the rest of the team are on. The new staff aren’t any better at their jobs than the longer serving staff: it’s just market rates.
so, I applied for another job outwith the company and lo and behold was offered a significant amount more than my current salary. my existing employer has offered to match this to keep me. Clearly they would need to pay market rates to replace me, and they are losing a lot of experience and expertise
aibu in thinking “no, you underpaid me for years, and are underpaying many of my colleagues”