Without Greed is Good, troops pick up 1/15 of their max cary per round starting on round 6.
Each rank reduces the denomenator by 1, up to 10 rounds. For example: troops with 1 rank of Greed is Good will pick up 1/14 of their max carry on rounds 6-19. Troops with maxed Greed is Good will pick up 1/5 of their max carry from rounds 6-10 (The battle will continue until your troops run out of stamina .)
Research Greed is Good in level 5 Market .