This is compatible, of course, with the existence of duties of justice as regards the benefits of industrialization and globalization; the poor may have become slightly better off, but the wealthy have undoubtedly gotten much, much richer, and we might develop theories that condemn this gap.
As Sreenivasan (2010) notes, a Hohfeldian claim-right in itself only entails the existence of a duty with a certain structure, and not a duty with a certain force.
I have a duty to clean up my messes and the existence of this duty does not appear to depend on how hard I have tried not to make a mess in the first place.
We limit our consideration to the existence of a duty to participate in bona fide medical research and public health surveillance, rather than a duty to participate in internal analyses performed by commercial data controllers.
In both cases, however, it is important to note that the existence of a duty to participate, as well as the assessment of whether it is a strong or a weak duty, must depend on an assessment of each individual case.
For it is not wildly implausible to posit the existence of a duty to donate one's organs for posthumous transplantation.
The set is not designed to serve as a 'checklist', or as a threshold to establish the existence of a duty in a particular case.
It is based on the existence of a duty of care between two or more parties.
The existence of a duty of care is normally easily established.
So they considered statements asserting the existence of rights, duties, and other legal relations to be incapable of being true or false (Olivecrona 1971, 246, 255, 261).
