Thanks, Edwin. This topic, while not completely tractable to hard science, is probably the most profound -- or at least, timely -- that FQXi has suggested so far.
To try and answer -- " ... the incredibly lop-sided distribution ('the 85') needs a solution that doesn't turn everything upside down. If your 'sideways' offers a solution, I missed it."
What does it mean for a person to be wealthy? I'm not speaking of the platitudinous -- wisdom, health and all the other substitutes for comfortable living that we preach to the poor, to try and convince them that they are better off for being poor, than having to bear the 'burden' of having money. I mean real comforts and privileges -- entitlements as human beings, to food, clothing, shelter, education and mobility.
We have been conditioned to think that were resources distributed equally, all would be poor. That conditioning is tied to the transparent motive that servitude to others' needs is requisite to anyone owning enough resources to enjoy life to the fullest. This primitive myth undermines the fact that all individuals' talents and abilities carry potential to increase the common good, to multiply wealth. Equality is not a matter of equal ownership; it is a matter of equal use. Equality is not a matter of equal opportunity; it is a matter of equal access.
In a world of lifetime free education and perpetual mobility, maximal access and use does not imply equal distribution of resources. It implies continuous and effective distribution; i.e., in contrast to the 'trickle down' philosophy of the putative 'job creators' (who do not in fact create jobs, only more wage slavery), the emphasis is on the free flow of wealth rather than a restrictive trickle. What universal entitlements to education and mobility effectively restrict, is the power of a few people to influence social policy by trickling money to their own preferred interests. Wealth and comfort should be measured in the variety of resources that individuals can apply to their own enjoyment and creativity, rather than restricting the ability of others to do the same. That controlling mechanism has to be checked, before individual wealth-creating abilities can be realized.
When wealth flows freely, even the very rich benefit from an all you can eat buffet. One is free to stay and stuff oneself, or to be sated and walk away -- to know that one has the choice, though, is the only true gauge of freedom.
Best,
Tom