This paper considers in detail the ontological and normative presuppositions of the state-contingent approach to pricing commodities first introduced by Arrow in his model of general equilibrium under uncertainty, which became a milestone in the theory of finance. By contextualizing Arrow’s fundamental contribution and subsequent developments in finance, it demonstrates how this new conceptual framework implied certain technologies—both intellectual and financial. In showing how theoretical thinking about finance was underlying institutional developments in finance, this paper complements the familiar narrative of (...) the performativity of economics. (shrink)