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1) Building a city on a resource means you get the benifit (if you build on a luxury, you get the happiness, if you build on iron, you can build swordsmen, etc). You still need to connect that city to your capitol via roads in order to trade it, though. It can do funky things to the actual tile, though. Since a city tile automatically gets 2 food/1 shield, I think building on an iron hill will cost you shields (iron hill, mined, under a non-despotic government = 1f/4s, if I recall correctly). I'm not entirely clear on what happens with the bonus commerce from a luxury tile.
2) You can trade your only source of a luxury or resource, but not if you are receiving that 1 source via trade.
Example: you have one source of iron in your territory. You wish to trade it in exchange for a tech & a luxury. That you can do.
Example2: you have no iron. You trade a tech & a luxury for iron from your neighbor. You cannot turn around and sell the iron to another civ.
3) "(0)" would mean you have only 1 source, and trading it would leave you without the resource for your own use.
-Arrian
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grog want tank...Grog Want Tank... GROG WANT TANK!
The trick isn't to break some eggs to make an omelette, it's convincing the eggs to break themselves in order to aspire to omelettehood.
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