David Warsh’s EconomicPrincipals.com this week discusses the change in the intellectual climate from the mid-1970s to today, in the context of three movements that rose up to challenge the social-democratic consensus, among which were the “’classical liberals’ or libertarians, exemplified by Ludwig von Mises, Friederich Hayek, Ayn Rand and Milton Friedman, worried by the threat to private enterprise posed by an expanding state.”