GTA V is a great game in many ways, but I think its economy is just busted. Ignoring a couple of tricks there's just no way to make enough cash for the most expensive properties. And given the money you get from heists everything else becomes pretty irrelevant as a source of income. When you buy a property it takes ages before you even make back the investment. etc..
So anyway this thread isn't supposed to be about GTA V. I'm curious to hear what OW games you think did economy best?