Libertarianism is the social philosophy that identifies individual liberty as the most fundamental social value and, by extension, treats voluntary cooperation as the only morally permissible form of social interaction. This succinct work addresses some common doubts about libertarian theory centered around the claim that it has to balance its excessive moral ambition with the requisite degree of realism," practicality," and "compromising." To that extent, it addresses subjects ranging from the usefulness of ethical principles, to the feasibility of efficient interventionism, to the stability of libertarian anarchy. In other words, its aim is to suggest that the libertarian philosophy is not only theoretically rigorous and practically relevant, but also eminently feasible in strictly pragmatic terms."