Hayek's term for the idea that all institutions in society were or should be "deliberately constructed by somebody"; "constructivists … habitually argue on the assumption of omniscience," rather than acknowledging, as Hayek does, the necessarily limited character of human knowledge in society
No doubt the most widespread theory of social classes at present is the constructivist one. Constructivism is a trend in contemporary social science according to which reality – social and/or material – is ‘constructed’ or ‘socially constructed’.
who would deny the existence of constructivist projects of desire
the footnote after constructivist refers to Hayek's "The Persistence of Constructivism in Current Thought" in "Law, Legislation, and Liberty"