 Philosophers have discussed not only how rights can conflict, but how they sometimes support one another. For example, Henry Shue has argued that both rights of security and rights of subsistence are “basic rights” because they are indispensable for the full enjoyment of all other rights—while other rights are non-basic because they are not indispensable for the enjoyment of these two. If the enjoyment or realization of a controversial right is an important precondition for the enjoyment of an uncontroversial right, one can defend the controversial right by documenting its strong supporting role. Such a “linkage argument” is used by Shue to defend the right to subsistence as a basic right, and by Sen to defend rights to democracy and freedom of the press as supportive of the right to adequate nutrition in developing countries (Shue 1996, Sen 1999). Shue’s and Sen’s assertions have been criticized as exaggerated (Nickel 2008, Myhvold-Hanssen 2003 (in the Other Internet Resources)).