What was Fran's job? (Where did his money come from?)

I enjoyed this film.

But, for some reason, I was distracted by Fran's source of income being unclear. Did he have a job? (I don't think we're ever told what he does for a living.) Had he inherited money? He certainly didn't appear to being living frugally.

I guess I just needed to see/hear more of Fran's backstory.