Salary assumes that characters have a steady job or a way to earn a living at the start of the game (that may change). Salary doesn't include money characters may earn during the course of adventures.The income is measured in credits per month.Credit is the Human Empire currency and is roughly equivalent to one dollar.
Characters will have a certain standard of living to maintain.While they
may go on extended journeys to distant places, they will still have a
number of fixed expenses (food,rent...) that will have to be paid each month.
For each lifestyle,there's a level of Social standing required (I've you ever seen a King living in a slum ?).