In particular, rigid order A x A y Ns are heavily modified by A y , distorting the meaning of the head noun in the direction of the closest adjective quite drastically, and only undergoing a slight modification when the A x is added.
in rigid order phrases, for example rapid social change, the A y N expresses a single concept (probably a "kind", in the terminology of formal semantics), strongly related to social, social change, which is then modified by the A x .