Judgment aggregation functions and ultraproducts

Herzberg F (2008) Working Papers. Institute of Mathematical Economics; 405.
Bielefeld: Universität Bielefeld.

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The relationship between propositional model theory and social decision making via premise-based procedures is explored. A one-to-one correspondence between ultrafilters on the population set and weakly universal, unanimity-respecting, systematic judgment aggregation functions is established. The proof constructs an ultraproduct of profiles, viewed as propositional structures, with respect to the ultrafilter of decisive coalitions. This representation theorem can be used to prove other properties of such judgment aggregation functions, in particular sovereignty and monotonicity, as well as an impossibility theorem for judgment aggregation in finite populations. As a corollary, Lauwers and Van Liedekerke's (1995) representation theorem for preference aggregation functions is derived.
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Herzberg F. Judgment aggregation functions and ultraproducts. Working Papers. Institute of Mathematical Economics. Vol 405. Bielefeld: Universität Bielefeld; 2008.
Herzberg, F. (2008). Judgment aggregation functions and ultraproducts (Working Papers. Institute of Mathematical Economics, 405). Bielefeld: Universität Bielefeld.
Herzberg, F. (2008). Judgment aggregation functions and ultraproducts. Working Papers. Institute of Mathematical Economics, 405, Bielefeld: Universität Bielefeld.
Herzberg, F., 2008. Judgment aggregation functions and ultraproducts, Working Papers. Institute of Mathematical Economics, no.405, Bielefeld: Universität Bielefeld.
F. Herzberg, Judgment aggregation functions and ultraproducts, Working Papers. Institute of Mathematical Economics, vol. 405, Bielefeld: Universität Bielefeld, 2008.
Herzberg, F.: Judgment aggregation functions and ultraproducts. Working Papers. Institute of Mathematical Economics, 405. Universität Bielefeld, Bielefeld (2008).
Herzberg, Frederik. Judgment aggregation functions and ultraproducts. Bielefeld: Universität Bielefeld, 2008. Working Papers. Institute of Mathematical Economics. 405.
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