Sentence:  For now let us look at the <WSD>supererogation</WSD> which would be contrasted with mutual aid. ... [T]here would be two fundamental types of <WSD>supererogation</WSD>. <WSD>Supererogation</WSD> 1 focuses on the same sorts of situations and the same sorts of aid covered by mutual aid, but removes the limit on the cost to the giver: ... <WSD>Supererogation</WSD> number 2 focuses not on situations where basic needs are threatened, but on well-being, ... 
Meaning of the word marked with <WSD> tags:  An action that is neither morally forbidden nor required, but has moral value.