[The Don]

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If rights are not synonymous with abilities, then what ARE they? You may not use a protractor to answer this question.

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A right is something a person enjoys without the coercion of others. Self-ownership is a right. Property derived from labor or homesteading is a right. Consensual, voluntary exchange is a right. These are all natural.

"Man has the right to exert force if he is more powerful than another man."

This is what you are saying. Logically expand from there and see where you end up.