William Flax
Egoism - 1) man is the proper beneficiary of his own actions
2) man is an end in himself and not the means to the ends of others or society
3) man exists for his own sake and is not a sacrificial animal that exists for the sake of others or society
4) man is neither an altruist nor a subjectivistic egoist
Selfishness man is concerned about his own true interests
Individualism - man is a sovereign individual over and above society which is a means to the fulfillment of the ends of the individual.
In a free society with a rational culture and a just government, egoism, selfishness, and individualism are parts of the foundation of a modern proper system of division of labor. The extensive division of labor is necessary for the process of production which is necessary for the production of wealth which is one of the real goods necessary for happiness.
Since Adam Smith, it has been known that if individuals rationally seek to do good for themselves, each of them can in fact achieve his good. And in a division of labor capitalist society, in the very nature of the process, in seeking his own good, the individual promotes the good of others, whose self-interested actions likewise promote the achievement of his good.