 Considerable empirical evidence has confirmed Ellsberg’s informal observations and related phenomena (beginning with Becker &amp; Brownson 1964 and including classic studies such as Slovic &amp; Tversky 1974 and MacCrimmon &amp; Larsson 1979; see the classic Camerer &amp; Weber 1992, as well as the more up-to-date Trautmann &amp; van de Kuilen 2015, for further details) and the literature now contains a substantial number of generalisations of SEU that can accommodate these.