[see 'Update' below]
I know discussions of actual applied politics are to be avoided. I don't want to start one.
But I thought LessWrong people might be a source for where the best arguments have been made for libertarianism in the economic sense (not why you should stay out of people's bedrooms). Even better, arguments for some degree of socialism in the same place would be nice. It seems there is a natural continuum. To pick one specific realm: anywhere from 0% to 100% of a person's income could be allocated for redistribution to even things out. Where to put that number will inevitably be a matter of grubby politics (won't it?). But still, arguments for why we should have a low number or a high number must involve some basic disagreements which could be (hopefully) separated into different values, different estimated probabilities, and different attempts to apply a rational analysis.
The world is dripping with partisan analyses along these lines (with "warfare" rules). Where are the best ones that avoid that failing?
I considered posting this under "dumb questions" but I judged that it's not really a question about LessWrong per se.
Update: Thank you to all who took the time to reply. Perhaps I'm learning about how some would start applying consequentialism to a real-life problem. I expected people to point me to discussions about what's right and what's fair -- which is what I'd expect in most other forums. But I guess here my responders so far are taking this to be a sort of question for technocrats who can work out the utility. So my next question will be about consequentialism once I've thought about it a little more.
Naturally, it will depend on what you mean by Libertarianism and Socialism.
To take just the issue of "redistribution", Milton Friedman was for a negative income tax and guaranteed minimum, apparently Hayek was as well, Thomas Paine had his Agrarian Justice. According to your terminology, are these guys Libertarians, Socialists, or neither? Libertarians with "some degree of Socialism"?
http://en.wikipedia.org/wiki/Basic_income_guarantee
Tabooing the terms may get you farther, as then you may identify the particular policies you're concerned with.
UPDATE: Friedman's support of a negative income tax and vouchers were intended by him as a temporary measure, a way to wean people off of government support. Saw him talk about it on a video recently, but haven't been able to dig up the link.