First Aspect
Veteran
Or if other people can't do it.In a market economy, it doesn't really matter if the job is technically equal, if no one wants to do it, you have to pay more, because the market says it's a different job.
As someone who was taught maths by geography teachers and German by people who couldn't speak German, and music by people who happened to have a key to the music room, I can assure you that all subjects are not created equal. It's naive to presume so.