Hayek, highly influenced by Mach as a young man, began reading him immediately following his return from service in World War I. He remarked about fo… - Alan O. Ebenstein

Law, Legislation and Liberty was written and published during a different period from The Constitution of Liberty. The earlier work was a product of the late 1950s—a generally optimistic and socially cohesive time when Hayek himself was in his late fifties, at the University of Chicago. Law, Legislation and Liberty, on the other hand, was a product of the 1960s and 1970s, a far more turbulent time, as he became an old man, was somewhat intellectually isolated in Freiburg and Salzburg, and experienced depression. That the later work has a different feel from the former is hardly to be unexpected. The relationship between the two works might be considered to be something like that between Plato’s Republic, a product of his prime, and Plato’s Laws, a product of his old age.

Hayek emphasized the importance of rules. He thought that what society should do is not to direct the individual in his or her particular actions, but to create a metaphysical structure, as it were, enforced by rules or laws, that create stable expectations and thus allow rational action.

Government creates the market and law. Law is not the negation of liberty; it is its fulfillment. Right law is not a restriction on people’s liberty; it makes their freedom possible. Right law is liberty; liberty is right law.