 The connection between the arguments and positions in 1930s scientific epistemology or philosophy of science and the arguments in the debates in the history of economics points to a kind of unity and continuity in Neurath’s thinking in which specific claims in epistemology and social thought are historically as well as conceptually connected. This unity is moreover an instance of Neurath’s persistent views: his pragmatic and conventionalist epistemology and his view of the unity of science.