 One background worry against which such scepticism may be set is an oft-expressed concern at the proliferation of rights by either extending the list of right-holders or expressing more demands as rights claims. The concern is that the prodigality of rights attributions devalues them rights. A favoured metaphor in this context is monetary: the inflation of rights talk devalues the currency of rights (Sumner 1987, 15; Steiner 1998, 233). 