Let's suppose that, contrary to the argument I gave below against Libertarianism in a vacuum, that we granted the wholesale implementation of the Libertarian premise therefore leaving ourselves open to the charges Larry has leveled. Let's recall then that the charge is Libertarian does nothing to prevent runaway absentee ownership, thus in effect creating a privileged ownership class. In essence Libertarianism implicitly allows the creation of private property monopolies, not to mention corporate / business monopolies.
I believe a defense of this may be rather simple in that, there's nothing within the Libertarian premise which would prevent the creation of labor monopolies. At least in theory a labor monopoly could work on a large institution or corporations ability to acquire and monopolize absentee ownership as without the means to produce or purchase, large institutions cannot monopolize without labor monopoly consent and/or labor assistance.
Second, granting that labor monopolies could be a potential reality (and so far as I can see there's nothing within the Libertarian premise to prevent it) there is additionally nothing to prevent blackmail. In fact there is some consent amongst Libertarians that blackmail which does not involve threat or harm, but perhaps more towards reputation and in this case the threat of work, is completely allowable. As such blackmail, specifically though labor monopolies, could be employed in some tactical manner to prevent monopolies on absentee ownership.
Of course where all this sounds rather corrupt, and admittedly I haven't thought it through all the way to the bottom, it could at least in theory work as not just a preventive measure, but as a measure to keep both sides honest.
*The Barefoot Bum
*The Barefoot Bum