Firethorn,
Thanks for responding.
Your points are good ones and you actually answered the question ie. there is nothing in Lib political philosopy that would prevent contractual slavery.
The thread was getting tired but I think my question raised a issue that put it to sleep.
Perhaps the more vocal Libertarian supporters would rather not admit that if their free-wheeling positions on issues drugs, assisted suicide and so forth were applied to something as universally inhuman as slavery it would have to be "an option", at least intellectually.
Again, thanks
S-