@Joethreeblah: The 4 coins are for taxes, the way I see it. Add to that 3 times +2 from trades. And an additonal 2 from resources.
Why are you looking for 31? The lefthandside list is production of culture, and effect on health (negative: forge and positive: aquaduct).
Why are you looking for 31? The lefthandside list is production of culture, and effect on health (negative: forge and positive: aquaduct).