<Para ID="Par1">We provide several characterizations of unanimity decision rules, in a public choice model where preferences are constrained by attributes possessed by the alternatives (Nehring and Puppe, Games Econ Behavior 59:132–153, <CitationRef CitationID="CR27">2007a</CitationRef>; Nehring and Puppe, J Econ Theory 135:269–305, <CitationRef CitationID="CR28">2007b</CitationRef>). Solidarity...</citationref></citationref></para>

We provide several characterizations of unanimity decision rules, in a public choice model where preferences are constrained by attributes possessed by the alternatives (Nehring and Puppe, 2007a,b). Solidarity conditions require that when some parameters of the economy change, the agents whose...