Full Idea
A common objection to Rawls is that hypothetical contracts, unlike real ones, have no binding force.
Gist of Idea
Hypothetical contracts have no binding force
Source
Adam Swift (Political Philosophy (3rd ed) [2014], 1 'Rawls')
Book Reference
Swift,Adam: 'Political Philosophy (3rd edn)' [Polity 2014], p.29
A Reaction
[I think Dworkin made this point] 'Contract' may be metaphorical. Perhaps it is just an 'initial agreement' or a 'working arrangement',