Do we really need to spell this one out? Ms. Lohan has an alcohol problem, from which she is (presumably) recovering. The economy has a money problem, from which it is (we hope) also recovering. As long as Economy > Lohan holds true (which is admittedly not a very high goal), then the lady here assumes that she will have enough fluid capital to repel the advances of slow moving barflies.
I think her premise holds together well enough to serve as an excuse to fend off his advances. It’s not like anyone’s paycheck is pegged linearly to the Dow Jones Industrials average, but there is an implied relationship, perhaps something along the lines of a “Heaviside step function” (if the economy tanks below a certain limit, then her income will suddenly decrease to zero, because she won’t have a job at all).
The woman is a regular character, and not particularly a jerk. So it’s peculiar to see her getting so elaborate in her refusal, instead of simply declining, as James’s #1 suggests. Maybe the guy has been persistently bothersome for a while.
Kilby has it in #2, and references to Oliver Heaviside always make me smile.
As far as mitch4’s reply is concerned, yes she is a regular character (her name is “Mia”), and while I would agree she is not particularly a jerk, she can be… uh… rather refreshingly honest, particularly when it comes to dating. And she does posess a a certain sardonic wit. In addition, Mia shooting down a guy at the bar who has been hitting on her has been a recurring theme in the strip. Vic Lee has described her this way: “Mia tends to be the sober voice of honesty and reason in the relationship department, which is why she is never in one.”