During World War II in Britain, a social ethos induced people to sacrifice personal interests for the sake of the war effort, and everyone was expected, as a matter of justice, to “do his bit,” to shoulder his just share. It is absurd to suppose that someone could have stated precisely what amount of sacrifice that injunction required, and it is true, therefore, that, with respect to many people, one couldn’t tell, and with respect to some, they couldn’t even themselves tell, whether they were sacrificing on the required scale (2008: 353).