| The behavior of the perturbation map is analyzed quantitatively by using the concept of contingent derivatives for set-valued maps under Benson proper efficiency. Let W(u) = Pmin[G(u),S],y∧∈W(u∧). It is shown that, under some conditions, DW（u∧,y∧）?Pmin[DG（u∧,y∧）,S] , and under some other conditions,DW（u∧,y∧）（u）?Pmin[DG（u∧,y∧）S]. |
