That's great advice, can you tell me in more detail how I can set up my economy for success. I am trying to build schools in all my cities in a different game with the Romani, and I have gone to greece first to campaign.
First of all, look at the building descriptions - give special priority to building anything that increases trade (including, but not limited to, mercantile buildings, docks and roads). Also, if you're given the option of mining, do it when you can. For public order, never underestimate the good effect that temples and hygiene buildings (sewers, baths, aquaducts, etc.) can have.

Schools won't be all that useful - all they do is decrease corruption in a city, and while that can slightly increase your income, it doesn't develop the economy. -M