[pvn]

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P1. All humans own themselves.
P2. No human has claim on the person of another, absent the former's consent.
P3. No human can exist outside the physical confines of space (IE, "territory").
P4. All humans own their labor and the products of their labor, including any territory they improve.
P5. No human has claim on the labor or property of another, absent the former's consent.
P6. If humanity does not kill itself first, someday all territory will be improved, and therefore owned.
P7. A human will be born after all territory is owned.

C: The human born after P6 will be unable to occupy space without the consent of another, demonstrating that his self-ownership is not absolute and falsifying P2. He will also be unable to labor without the consent of another, demonstrating that his ownership of his labor is not absolute and falsifying P4.

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Wrong. Excluding Person A from occupying space X does not give one control over Person A's labor. I may own a car and not have anywhere to park it. Do I no longer own it?

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While P6 and P7 are not demonstrable, they are entirely consistant with and permissable within the bounds set by Premises 1-5, and they are consistent with the fact that humans have, throughout their history, shown the ability and inclination to both improve land and spawn more humans.

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All of the land on earth is already "owned" in practical terms for the purposes of this discussion. Even antartica, since governments have conspired to prevent any individuals from claiming it.