trajectory? meaning?

I have questions...
Will future employers assess your last drawn salary or amount of relevant exp and offer you?
For example:

first job: $2***
2nd job: $1***
3rd job: ???

If the 3rd job you have applied is somehow relevant to your first job, will the new employer offer based on the 1) salary of the first job, 2) last drawn or 3) a totality of the 2 jobs you have worked previously?