I just finished a game, playing the Torians. My population was almost the double of the 2nd highest player in the game, but being a Torian with a lot of Morale bonus, I guess it's normal.
But when I look at the graph, I see something I see in everygame: the Economic graphic. My line NEVER ever stop getting up, with 30 degree inclination, while all the AI's linger below me, with a barely 20 degree inclination.
I play at "intelligent". On basic paper, I always have more tech, more economic, more manufacturing (or almost always, me being 2nd).
I know, people will tell me "play at higher difficulty" (I will next time!), but what is the difference in my developpement? How is mesured the economic graph? What do I do that makes it better?