At Marginal Revolution, the article Rent Seeking Kills makes an argument to legalize organ sales.
One respondant writes:
The people who are worried about slayings committed to involuntariyly harvest human organs are jumping at shadows. It might happen once in a great while under a regime of legalized organ sales, but far less than under a black-market regime. If anything, the option to pay for an organ from a voluntary donor is a substitute for knocking someone on the head and stealing it.
Outside the fact that this fellow has no real evidence about frequency (he's merely asserting it), we might ask if this same argument applies to murder. Right now there's a black market in murder: should taking lives be marketized?
A common theme at Marginal Revolution is "markets in everything". A common libertarian fantasy. So what would a murder market look like?
If you wanted to murder, perhaps you'd be required to negotiate for suicide, or buy a hunting/execution permit.
Or perhaps people would be issued a "life rights" deed, which they could hold onto or sell. The holder of the deed would be able to kill the "property" at whim.
We can explore this, but the basic problem is what societal purposes are being served with the creation of this market?
Additionally, our initial revulsion at this concept indicates subtle problems due to undermining of traditional underpinnings of our social institutions, especially the basic liberal assumptions of bodily security which are essential to political and commercial activity.