Earlier quoted context omitted.
The economy already isn't the limiting factor on establishing a Mars colony; technology is. So it's irrelevant.
It'll be much more difficult to convince citizens to set up a Mars colony at a cost of $1,000,000 per citizen as opposed to only $1,000 per citizen. Therefore, I'd argue it is relevant. If you were talking about setting up a privately owned colony - a larger economy means there is more chance of a company large enough to take on this task. (In large economies capital is more concentrated, at least that's what I'm obs…
So every citizen spends $1000 and suddenly you have a Mars colony? No, you have to develop the technology, and that takes time no matter how much money you throw at it. And when you look at the year 2042 and imagine having a Mars colony by then, having an order of magnitude more money rolling around by say 2022 or 2032 won't help if it takes longer than 10-20 years to develop the needed technology.