Well, none. I don't believe SS should be used to equalise earnings between 2 people who have different earning potentials, and where neither spouse sacrificed earning potential during marriage (or augmented earning potential at the expense of the other). SS should only be equalising an earnings or asset advantage/disadvantage that occurred **as a result of the marriage**. SS should not consider care of children after split-up - that is what CS is for. Any other expectation is a holdover from the 'women need looking after' belief.
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