To the guy who couldn't figure out the population thing, it is referring to that specific population, like ecoworkers/employees/executives ect... so check to see if your specific population is up to par...
that made no sense, money IS your wealth. Your getting confused with income. Wealth is money, income is, well, income. As for population, you have to check the demands of your population, click on a house, and see what they need to advance, once you provide them with the materials and/or buildings, the buidlings will start to advance, new build options will appear. Also you population will rise, as your buildings give larger occupency.
[Edited by rcboothman, 12/1/2011 4:39:55 AM]
Use this site.. it has everything you need to calculate. to have a positive income you need more house's(tax would be the income) and lots of them.I have gotten mine up to over 15k+ in large maps and this is with out using a trainer.