Question

Gaddis the concept of seniority, which some employers use to hire and fire workers is

Answer 1

If three people work for a company: 
A, who has worked there for 5 years,
B, who has worked there for 20 years,
and C, who has worked there for 1 year,
B has seniority over A and C, A has seniority over C. In most companies, this would mean that barring other factors, C would be fired first because C has the lowest seniority.