| | In post #4, Merlin said, "My challenge depicts egoism and altruism as two intersecting, or overlapping circles. An act in the overlapping section is good both for one's self and for one or more others. I think the overlapping section is fairly big."
There is a possible confusion in the first part of that statement. Altruism, by any definition, is a theory. That is the genus. Those venn diagrams have actions. Specific actions have specific properties which include motive. There are going to be some acts that appear identical to an observer but have properties: e.g., motives, the context of the specific actor's life which is on some sort of trajectory, the teleological properties, and the actor's moral code.
All of this is to say that acts aren't comprable in this way. They are apples and oranges even when they all look like apples.
Add to that the problem of accurately measuring the 'benefit' of an act without first having a standard that applies to all actions. 'Benefit' is an ethical theory dependent variable. So, some actions can't be sorted into those that benefit self or those that benefit others without using an ethical theory to examine them. For example, the Dali Lama, Ayn Rand, and the Pope would disagree as to who benefits from some actions.
I agree with Bill's point that altruism and rational egoism are mutually exclusive - it is because they are theories describing the principle of valuation, not a collection of disconnected acts.
But having said all of that, there is a valid point to be made from what Merlin has said, and it is a valuable lesson. There are actions performed out of self-interest that incidentally benefit others, and there are natural laws that speaks to that fact. The more I value a friend, the more it is in my interest to act to benefit my friend. Friendship is an area on the continuum of the possible relationships and the degree to which our mutual benefit overlaps. In business a complete stranger can find themselves being benefited by my selfish acts. And here is the heart of this... This continuum, in reality, exists over time, and within a context - a political, economic and technological context.
We are the builders of our culture, we live within the culture and we use it as an important tool in life. Our culture determines how much capacity to act we have in many areas. If I live in a culture that is rich in material wealth, stable with long-standing political freedom, and possessed of advanced technology, then I will tend to be benefit others when acting in my self-interest far more often than if my culture is poor, oppressed and primitive. Think about that when people use life-boat examples in ethical questions. They are stripping away the context that was created by people acting within a given ethical theory's context - they are stripping away all of the history of that culture. They are saying, "Well, pretend that all of the possible benefits of rational self-interest practiced over time are gone - no laws, no trade, no benevolence, no technolgy that would let you escape life-boat situations, no material wealth that would have been applied to prevent such situations, now tell me how to resolve this lifeboat situation?" We acquire enduring benefits over the passage of time from observing the right ethical theory, not just as individuals, but as a society - these benefits are additive. They are cultural, political, economic, and technological.
These benefits confer options. The richer we are as individual and as a culture the more options we get to choose from. The more options we have, the more our choices will tend to show greater benefits per act - for ourselves, and for others. And more people will 'feel' like a friend than if we are in a primitive society where we are closer to a raw survival level.
Merlin is right that a great many actions overlap - that is, the richer a culture, the easier it is be benefit others while pursuing rational self-interest. But it isn't an overlap of altruism and rational egoism, it a benefit of the savings over time brought by freedom, human ingenuity... savings of capital and increased technology. Altruists have always had to act in their self-interest to some degree just to stay alive, and the richer the culture, the easier that is.
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