The selfish life-cycle model or hypothesis is, together with the dynasty or altruism model, the most widely used …

to transfers of gifts inter vivos. We suggest that the equal division motive competes with traditional altruism: support … income compensation should be stronger in one-child families and we expect the altruism motive to dominate the equal division …, which also support the equal division motive. -- Inter vivos gifts ; equal divisions altruism ; sibling comparisons …