Another angle I would say, in yourself, include more people, include the society also. When you say self, you think about only yourself, or your employees, or your company. Now, your company cannot stay on if there is no sustainable growth in the society. If there is no buying power in people, there is no point in you manufacturing so many things. Nobody has the power to buy them. What do you do? So, you need to in your self interest also keep in mind the buying power of the people. This is equally important as the manufacturing power that you want to possess. So this buying power of people also gets included in your self interest.
I think that is one good way to look at one's self interest in terms of the whole society.