 Still, MEU remains rather restrictive, as it enforces a fairly radical form of ambiguity aversion. One popular generalisation of the model, \(\alpha-\)MEU (Ghirardato et al. 2004), proposes that the preferences imposed by MEU lie only at one end of a spectrum of possible ambiguity aversion, captured by the following weakening of \((\ref{eq:MEU})\): 