They must participate in capitalism or trade and other activities that help survival. I don't think it just switches to doing favors.
I'm saying capitalism forces our hand to the maximum extent such that it eats away all time involving free favors to other people. The ladder is unlimited in height.
So if I have 8 hours or 16 hours available for productive work it doesn't matter, I'm going to allocate all of it to capitalism because that's a never ending hole.