1) Is it always inefficient?
2) Then convince the slaves that they are "volunteers."
3) A modest proposal: Treat the labor power and bodies of people as a "bundle of property rights" and then you can contract for the future use and/or destruction of their eyes, kidneys, livers, hearts, lungs, etc. and get rid of them when they are useless. What a great way to treat the prison population or not have to worry about the health of a mine worker.
4) Buying and selling babies seems to be on the table, esp. for the likes of Posner. Not slavery exactly but a nice step forward.
Jerry
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