Hayek never explained his support for UBS outright . However, it’s unquestionable that he firmly supported UBS.
The closest we come to an explanation is a quote from "The Public Sector and the Private Sector" in "Law, Legislation and Liberty, Volume 3: The Political Order of a Free People": The assurance of a certain minimum income for everyone, or a sort of floor below which nobody need fall even when he is unable to provide for himself, appears not only to be a wholly legitimate protection against a risk common to all, but a necessary part of the Great Society […]
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