Expressed egotism is, of course, no reason necessarily to disregard someone’s work, but it is a warning signal. If someone can evaluate his work so poorly, is the work itself likely to be better? In many of his areas of intellectual interest, Popper’s work is wanting.
Hayek did more to advance Popper professionally early in his career than anyone else, and Popper remembered his personal debt to Hayek. Over the years, he wrote him a number of appreciative letters.

At the same time, as Hayek maintained elsewhere, the facts of the social sciences do not lend themselves to the same degree of prediction, or explanation, as the facts of the natural sciences—it is for this reason that there are degrees of prediction or explanation. Prediction may be expressed numerically, moreover, “not as a unique value or magnitude but as a range,” narrow in the natural sciences and potentially very broad in the social sciences. In the social sciences, Hayek modified the conception of a numerical range to a “range of phenomena to expect.” This was his concept of pattern prediction, or explanation of the principle, broad, general predictions.

Where laws rule, people are free. Conversely, where not laws, but individuals, rule, people are unfree. Law is the indispensable tool for securing personal freedom, because only under the rule of law are individuals able to plan their lives according to known expectations about the social order.

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.

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Hayek’s essential political philosophy was that liberty is the supremacy of law. To some, this may appear a paradoxical conception of liberty, for liberty is too often considered to be the absence of law.This, however, was the exact opposite of Hayek’s view. He thought that liberty is not possible without law. Right law is liberty.

Hayek had high regard for Marx in technical economic theory and considered him a predecessor in his business cycle theory. [...] It was not in technical economic theory that the classical Austrians disagreed with Marx. So towering a figure in history is Marx that discussion of his thought in summary form is always difficult, for there is so much that he said and that others have said about him. At the same time, so tendentious, ill-spirited, and just plain wrong a thinker was Marx that it is surprising that he may have had some of the influence attributed to him. Hayek’s opposition to Marx was in the realm of practical political emanations from Marx’s thought. Here he considered Marx’s influence to have been wholly pernicious.

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 ripped G. W. F. Hegel in The Counter-Revolution of Science’s third part for his “historicism”—the idea, in Hayek’s terminology, that history moves in set and predictable stages. He considered this idea fatally flawed and societies that were based on it to be unsuccessful, unproductive, and unfree. Historicism denies free will. The future is what we make of it.

Placement of both Hayek and Mill in the liberal tradition is suspect to many historians of political thought for various reasons. First, Mill also expressed socialist sentiments, so to classify him as a liberal has seemed inaccurate to some more right-inclined liberals. Second, Hayek is sometimes considered more a conservative by left-inclined liberals, and not in the liberal tradition as it has evolved. Nonetheless, Mill and Hayek were the two greatest liberals of the nineteenth and twentieth centuries.

Hayek was too harsh on Freud. It is, indeed, one of the surprising facts of the development of intellectual thought during the twentieth century that Freud—who was so pervasive and dominating during the first half of that century—virtually dropped off the face of the map during the second half. Hayek was almost the last person still talking about Freud, in the sense of taking him as a serious living influence on civilization.

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