[@Leotamer] The world's been around for a while, it just hasn't had complex life. The usual stuff that's in an earth-like planet should still be there- iron, aluminium, gold, salts, what have you.

ed: you can still make them, though, obviously.

Working together to make something is exactly the same as making something alone. If one character puts time and effort into a thing to the value of one Might, then it's a special thing. If two characters both put that same amount of time and effort into one thing, then they've both spent one Might, and the thing is worth two.