Everyone assumes that everyone looks out for themselves first. That is not a controversial or novel idea.
The question is whether, in a team situation, one assumes that others are looking out for the shared interests as a group. If no shared interests exist, then the team has a much bigger problem.
The question is whether, in a team situation, one assumes that others are looking out for the shared interests as a group. If no shared interests exist, then the team has a much bigger problem.