 Of course, if sums are object-like, and one has reason to believe that the only objects are ones with structured essences, then one would have reason to reject Summativity and UFM which lead to the posit of unstructured Mere Sums. (Generality seems harder to reject). Arguments against these principles can be found in sections  2.3  and  3.1.  (See also Laycock 1972, pp. 4–5; 2006a, Appendix III).