[@Klomster]
I do have something sorted for the economy but it's only a factor for Nation RPers. And even there it's not that in depth as I find having to do constant maths to buy something as simple as a loaf of bread gets a bit annoying and frustrating :p. If you want I can PM you the different nation's economy stats?

In the RP itself if will be more "I gave him a lot of money" than anything else. You can specify how much money you spend but it won't really be subtracting it from a total figure.