The 5 Branches of Philosophy
Life As the Moral Standard
Reason Is Man's Means of Survival
Harmony Of Interests
Harmony of Interests
With a proper understanding of one's interests, it can be seen that there is a harmony of interests between rational men. That we benefit enormously from positive interactions with others. This benefit comes in the form of the abundance of wealth made possible by a Capitalism, to the continuing increase of knowledge available to mankind. It comes in the form of friendships, romantic love, and the support of one's family. The harmony of interests bring men together in peaceful cooperation to benefit their lives. This is the bedrock of society. It is why people choose to live in a society.
Although the desires of men may be opposed, their interests are not. Living in a peaceful society is of incalculable benefit to man. Any possible advantage gain from living outside of a peaceful society is insignificant compared to the loss. For instance, living in a wilderness may bring you more peace and quiet, but it is at the expense of friendships and the enormous material wealth possible in a society.
The harmony of interests only exists between rational men. Irrational men and the use of force are not in the interests of other men. Men's interests are only in harmony with peaceful, voluntary interactions. Only when men live by the Trader Principle do their interests unite. Only when men accept persuasion and trade do they become a benefit to other men.