1) An advocate of libertarianism 2) Milton friedman follower 3) Philosopher 
• (a.) Pertaining to liberty, or to the doctrine of free will, as opposed to the doctrine of necessity. • (n.) One who holds to the doctrine of free will.
Those who believe in minimal government interference in the market system, and in the maximum freedom of the individual.
Lib`er·ta'ri·an (-tā'rĭ* a n) adjective [ See Liberty .] Pertaining to liberty, or to the doctrine of free will, as opposed to the doctrine of necessity. Lib`er·ta'ri·an noun One who holds to the doctrine of free will. 
[n] - someone who believes the doctrine of free will
libertarian, libertarianism 1. One who holds the doctrine of the freedom of the will, as opposed to that of necessity. 2. One who approves of or advocates liberty.
noun someone who believes the doctrine of free will
(classic libertarian)(anarchist libertarian)