One of the responsibilities of any leader is to create a common goal for its followers. Make every member of the team know what they have to do, what is the style of the finished product, what is the basic product strategy, and when you must complete, etc. With a common goal to build a sense of belonging, making everyone feeling a whole, all working hard for a common goal. With the sense of belonging to the team, it is possible to eliminate the self-interest behavior of individual people.
Our boss has said to us: "if it is to be, it's up to me", although this is a bit too much absolute, but it is still a matter. In fact, a success of a project should depend on the efforts of everyone in the group. Everyone must have this feeling: the success of the collective is likely to be a personal success. If a project group is just a very important work in a project group. Ok, that is a good thing for a whole and the whole of this whole, this is also a failure. In a team, not only do you want to be "your own things", and when you see "Other people's things" needs to help, you can't have a mentality that you don't have to have. Because it is "your own" or "Others'" things are all things. If everyone has a common goal, I believe that such a thing will happen very little.