 So much for arguments in favour of the impossibility of bare dispositions. A strong argument for the possibility of bare dispositions begins with the thought that fundamental properties like spin, electric charge, etc., are all dispositional. This observation is put together with the assumption that, to the extent to which subatomic particles like leptons and quarks are fundamental, they cannot have any constituting parts. This assumption seems to be supported by experimental results in physics, showing that fundamental particles behave like point-like, structureless particles (Molnar 1999, 2003). But it entails that their dispositions cannot be grounded by the properties of their constituting parts. This seems to lead to the conclusion that dispositional properties of fundamental particles are bare dispositions, lacking any distinct causal bases (Harré &amp; Madden 1975; Blackburn 1990; Ellis &amp; Lierse 1994; Ellis 2001, 2002; Molnar 1999, 2003; McKitrick 2003b; the most powerful elaboration of this argument is given by Mumford 2006).