So economy points are construction, both constructing new buildings and upgrading them. It gives you economical XP. to enhance your economical and overall ranking
Killing troops is military points which will give you military XP to enhance your military and overall ranking.
Players with a lot of economical points aren't a threat as they build a lot and turtle
If you have a player with a lot of military points then he has an offensive and agressive play style, so perpare for war.