Collaboration even when you don't want it
During World War I, the trench warfare method developed. In it, the opposing sides launched attacks across no-man’s land in hopes of smashing through the lines and overwhelming the opponent. It was a miserable failure and cost thousands of lives.
Later they determined that other acts of war only made matters worse for each side. They could attack and destroy the other side’s food supply, but that would invite retaliation, so both sides would be left hungry. They could kill the medics that were trying to retrieve the wounded lying in no-man’s land, but that would cause the other side to do likewise; both sides' injured would not be recovered, and a new set of injured would be in that territory. So, from this, a certain collaboration took place. Both sides realized that there were combat operations that they could not or would not do, or it would make their situation worse. So, they were collaborating even if they didn’t want to. This is an example of an infinite game. It shows that within certain behavior forms, other embedded behavior forms exist, and they, in turn, dictate the main type of behavior that will take place.
The image shows what happens in infinite theory. If both adopt a mutual behavior, they both gain. If one adopts and the other does nothing, one gains and the other loses. If both do nothing they neither gain nor lose.