[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.
I wouldn't look for Grand Arguments about why every sphere of the economy should adopt libertarian policies. Most of these are based on bad philosophy. Look instead at individual policy issues and see what libertarians say.
For example: Milton Friedman's Capitalism and Freedom is split into individual chapters on policy issues. Few parts of the book take a big picture view of things. This is probably what you're looking for, but you also have to remember that it's a popular rather than a technical book, so if you find yourself wary of any individual empirical assertion you'll have to go hunting for the relevant literature on your own. The best arguments are buried in economics journals, along with the best arguments for significant government intervention, etc.
You'll also have to go digging from many different angles. That X policy works doesn't mean that X policy's benefits outweigh its costs, so you'll also have to dig through the empirical literature in Law and Econ and Public Choice to measure the cost of carrying out any individual policy.
Capitalism and Freedom is also outdated in many of its empirical assertions, though many have held up. Again, you'll have to go digging one-by-one.
I can help more if you narrow your question down to individual policy summaries. Asking for all the best arguments on antitrust regulation, free trade, the optimal level of taxation, the optimal type of tax, the optimal level of spending on education, anti-discrimination laws, the optimal level of spending on public goods, the optimal level of taxation on negative externalities, the optimal level of fiscal stimulus in a recession, the relative merits of monetary vs. fiscal stimulus, the net effects of redistribution, the net effects of occupational licensing, the net effects of each individual government regulation--to name just a few policy issues!--is way too tall an order.
Related: avoiding affective death spirals by cutting up a potential Great Idea into component parts.