What is a both sufficient and necessary condition for not treating people merely as a means?
To me the meaning of a concept is equivalent to a sufficient and necessary condition with which to classify and analogous to the effective mass of matter/ beings in general (energy is equivalent to mass).
A concept as I see it exists and is well defined if and only if there is a sufficient and necessary condition with which to classify.
E.g Am I being used merely as a means when the government enforces building, environmental, competition, market, hygiene, tax, employment laws or when a civilian enforces/stands by an agreement/contract or when an employer just fires me because he is performing poorly financially? All these cases lack the hypothetical consent.
I am particularly interested in the metaphysical and ontological implications and its application in science/epistemology and policy making.