“…This would give rise here to U b (Á) and U w (Á), respectively, indexed on b and w, so that 7 U b (w) 4 U w (b). Alternatively, Lapidus and Sigot (2000) would offer the possibility of representing preferences by a single utility function, provided this latter is defined on trajectories, which consist here of three monotonous trajectories, the last one being degenerated ({b, w}, {w, b}, and {b}), and one concatenation of two monotonous trajectories ({b, w, b}). The asymmetric effect would therefore be represented by the following inequalities: 7 U({b, w}) 4 U({w, b}) and U({b}) 4 U({b, w, b}).…”