 There is a vibrant literature, spanning many decades, engaging with Raz’s intriguing suggestions. see Sciaraffa (2009) for a survey of some of the earlier literature on this. More recent work can be found in McBride (2015), MacMahon (2018), Molina (2019), Murphy (2020), Kimel (forthcoming), and others. Much of this work is in legal theory, on the philosophical underpinnings of private law.