How do the Staff salaries work?
Game Manual:When you hire a new staff member, your current one is replaced, and you will need to pay your old assistant one week's salary in severance. You can also fire your staff member (paying one week's salary in severance) and you will be assigned a minimal skill assistant of that type. Since good help is hard to find, your staff will charge a pretty penny for their services. Every week, each staff member will demand a small increase in salary, so it's in your best interest to keep an eye open for fresh staff.
Do staff sometimes increase in skill?