Abstract
A correspondence Q from a domain set X to a range set Y associates with each element x in X, a non-empty subset of Y, Q(x). A function is a correspondence such that Q(x) is a singleton for each x in X. It is for this reason that a correspondence is also termed a multi-valued function or, more simply, a multi-function. Another name for a correspondence is a set-valued mapping.
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Khan, M.A. (2008). Correspondences. In: Durlauf, S.N., Blume, L.E. (eds) The New Palgrave Dictionary of Economics. Palgrave Macmillan, London. https://doi.org/10.1007/978-1-349-58802-2_326
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