“…given two problems (N, E′,c,a′,w) and (N,E,c,a,w) such that ∑ i∈N c i ≥ E′>E, and for any i,j∈N such that c j ≥c i , a i =a j and w i =w j , and the ratio of an individual's asset in the two problems is proportional to E′/E, i.e. This property says that if total assets increase due to proportionate increase in individual assets, an agent with a greater claim receives no less share of the increment than the other (Dagan et al 1997). …”