This is a quote from the book "The Virtue Of Selfishness" by Ayn Rand
...t which is of greatest personal (and rational) importance to him. In the above example, his wife’s survival is of greater value to the husband than anything else that his money could buy, it i
s of greatest importance to his own happiness and, therefore, his action is not a sacrifice.
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But suppose he let her die in order to spend his money on saving the lives of ten other
women, none of whom meant anything to him — as the ethics of altruism would require. That would be a sacrifice. Here the difference be- tween Objectivism and altruism can be seen most clearly...