So I saw this video on the forums. It's a great video overall but a lot of people ask why we don't have trading and at 8:41 in the video he tell's you pretty much why. Overall a great video might answer some things you were wondering about as well.
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If there was trading, I wouldn't have played this game half as much because I would have had everything I wanted early and probably would have got bored. I don't think trading is necessary either.