The law of cooperation in Washington says that one person does things perfunctorily, two people shirk each other, and three people will never get anything done. It is somewhat similar to the story of the "three monks".
The cooperation between people is not a simple addition of manpower, but is much more complicated and subtle. In human-to-human cooperation, assuming that everyone's ability is 1, then the result of 10 people's cooperation is sometimes much larger than 10, and sometimes even smaller than 1. Because people are not static objects, but more like energies in different directions. When they push each other, they get twice the result with half the effort, and when they conflict, they do nothing.