The Austrian theory of ...

The Austrian theory of subjective value teaches us that there are many ways to incentivize or motivate or induce someone to commit an action for you: you can promise sexual favors, promise to pay money, hire someone, and so on. Also, there is no reason to think that both the boss and his underling cannot both be 100% responsible: in the law this is called joint and several liability.
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 Stephan Kinsella

Quotes from the same author

In a market economy with the division and specialization of labor, people use others as means to achieve their ends. This is the essence of market cooperation.
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 Stephan Kinsella
The basis of self-ownership is the fact that each person has direct control over the scarce resource of his body and therefore has a better claim to it than any third party (and any third party seeking to dispute my self-ownership must presuppose the principle of self-ownership in the first place since he is acting as a self-owner).
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 Stephan Kinsella