 The reason why cp-laws of this type are called “comparative” in Schurz (2002) is that the requirement that the other \(X\)-independent variables \(Z_1 ,\ldots ,Z_n\) ‘are equal’, or remain at the same values, only makes sense if the law compares two states of a described (kind of) system. These two systems differ in the value of the antecedent variable \(X\), but agree in their values of the \(X\)-independent variables \(Z_1 ,\ldots ,Z_n\). If the latter condition holds for all possible values of the \(Z_1 ,\ldots ,Z_n\), the comparative cp-law is called unrestricted; otherwise it is called restricted (see below). Another plausible name for this kind of cp-law would be ‘equality cp-law’ (this was suggested by the referee), because it merely requires that the remainder factors are ‘equal’ in the two compared states of the described system, rather than that some of them have to be excluded (as in exclusive cp-laws). 