If the robustness curves of two allocations, formula_18 and formula_21 are compared, the fact that the two curves will intersect is noticeable, as illustrated in Figure 8. In this case, none of the allocations is strictly more robust than the other: for critical revenues smaller than the crossing point, allocation formula_21 is more robust than allocation formula_18, while the other way around holds for critical revenues higher than the crossing point. That is, the preference between the two allocations depends on the criterion of failure – the critical revenue.