On the other hand, Poste Italiane per capita volume is among the lowest in the industrialized world, and so its delivery costs proportion should be among the highest.
Italy's delivery prices are higher than France. 
mnli hypothesis: Italy's delivery prices are higher than France.  premise: On the other hand, Poste Italiane per capita volume is among the lowest in the industrialized world, and so its delivery costs proportion should be among the highest.