I am blue, and achieved an economy score of 5457. My ally, grey, achieved a notably higher economy score of 6698.
However, when taking a closer look at economy stats...
As the screenshot depicts, I obtained more resources than grey in every category. Not the highest in the game, but definitely more than what grey collected.
How can my ally have more than 20% higher economy score even though I obtained more of every resource during the game? Are there additional factors that economy score takes into consideration other than what the achievements screen displays?