Does this mean that conversion of trade goods into Supply is turned on by default and that conversion takes precedence over using Supply produced by supply structures? It doesn't make much sense, but it's the only reason I can think of for Japan's starting -30 trade good Supply balance.

I'm trying to have my first game with Japan. I'm confused with the Supply system as it is explained in the manual and the Supply goods shown in Assets Balance. The tooltip for Supply in Assets Balance says I have a planned income of 1 and planned spending of 18 on turn 2. The situation was similar o...

1) I've read in the manual that empires can play with their taxation rate. How is this done? I can't find a way to change tax rate for either Roman Empire in the campaign and there is no other mention of this in any other part of the manual. 2) Sometimes I can't seem to train units although I have e...