I
want to elaborate on the notion of "formal constraints" that
you mentioned.
Rawls accepts the notion that there are certain standards that
principles of justice must meet -- and yet these standards don't actually
determine the content of the principles. This is similar to what
Perelman said about formal and material justice.
Here are some of the "formal constraints on the concept of
right" that Rawls recognizes:
- Principles are to be general. For example, they cannot
refer to particular persons.
- Principles always apply.
- Principles are to be universal. In other words, they
must apply to everyone.
- Principles cannot be self-contradictory.
- Principles must be publicly known.
- Principles must supply a way to order claims -- to
decide what is more important in case of conflict.
- Principles are to be final. They are the "final
court of appeal."
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Rawls summarizes his view in the following statement:
Taken together, then, these conditions on conceptions of right
come to this: a conception of right is a set of principles, general
in form and universal in application, that is to be publicly
recognized as a final court of appeal for ordering the conflicting
claims of moral persons. [Theory, section #23]
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