Be that as it may, there is a twofold problem with Smith’s and Hayek’s ‘spontaneous order’: First, it restricts too heavily the scope of Hume’s original notion of an order that evolves spontaneously. Hume thought that humans are prone to all sorts of incommensurable passions (. the passion for a video game, the passion for chocolate, the passion for social justice) the pursuit of which leads to many different types of conventions that, eventually, make up our jointly produced spontaneous order. In contrast, Smith and Hayek concentrate their analysis on a single passion: the passion for profit-making. Moreover, Hume also believed in a variety of signals, as opposed to Hayek’s exclusive reliance on price signalling. Secondly, Hayek’s argument that markets protect us from serfdom (. from authoritarian hierarchies) is weakened substantially by the fact that he has precious little to say about corporate serfdom; about the hierarchies that millions must submit to (when working for Wal-Mart or Microsoft for instance) in order to make a living or to get a chance to unfold their talents. 
Once a paradigm shift has taken place, the textbooks are rewritten. Often the history of science too is rewritten, being presented as an inevitable process leading up to the current, established framework of thought. There is a prevalent belief that all hitherto-unexplained phenomena will in due course be accounted for in terms of this established framework. Kuhn states that scientists spend most (if not all) of their careers in a process of puzzle-solving. Their puzzle-solving is pursued with great tenacity, because the previous successes of the established paradigm tend to generate great confidence that the approach being taken guarantees that a solution to the puzzle exists, even though it may be very hard to find. Kuhn calls this process normal science .