income taxes

You've not really explained your idea but I agree with thLove, a sense of achievement is good. And if you're talking about a population based monetary income that wouldn't really work IMO. To make it worthwhile for low levels it would have to be quite high per citizen. By the time you get a few cities with 6390 (?) citizens each, and trading prices at 0.01-0.03 for resources, the amount of money people have will be stupidly large

exacto mondo