To sum up: there are important differences between the letter and parcel traffic: (1) the letter traffic is a monopoly in which the more profitable business belongs to the State as well as the unprofitable, while the parcel business is not a monopoly, and any traffic which proves profitable may at once attract private competition; (2) in the letter traffic the cost of transmission for a given distance is negligible, and in the parcel traffic it is important; (3) the social arguments which make it desirable for the State to secure as wide as possible a diffusion of letters containing information, of newspapers, books, and samples, do not apply in the same way, or to the same degree, to the traffic in parcels containing goods. * * * * * In essentials the case of international rates differs little from that of inland rates. The work in connection with a letter falls into three main divisions: (1) at the place of posting; (2) transmission from place of posting to place of delivery; and (3) at the place of delivery. In the case of inland letters, the first and third factors preponderate to such a degree that their cost alone need be taken into consideration in fixing the rate. The factor of transmission can be ignored. In the case of letters from one country to another, the services at the offices of posting and delivery are performed under different, instead of under the same, administrations, but for all practical purposes are otherwise unaffected. The only factor seriously affected is that of transportation. The variation in the cost for transportation[652] depends largely on distance, and in that respect various countries are affected in varying degrees, not only as regards the actual distances over which their letters for or from places abroad are sent, but in the way in which those distances compare with the distances over which letters in the inland service are conveyed; and the question therefore wears a different aspect in the different countries. Thus a very large proportion of letters in the British service are forwarded over greater distances than letters in the inland service. The same thing is probably true of France and Germany. Distances in the inland services of the United States and Canada are, however, comparable with the distances in the international services in Europe, and in many cases with distances in their own international services. If, therefore, mere distance of transmission were the only consideration, there would obviously be little to urge against the application of the ordinary penny letter rate for inland transmission, at least to the traffic of the whole of Europe, just as it has been applied to the traffic of the whole of the United States and Canada.[653]