Trade among any number of countries, and in any number of commodities, must take place on the same essential principles as trade between two countries and in two commodities. Introducing a greater number of agents precisely similar, cannot change the law of their action, no more than putting additional weights into the two scales of a balance alters the law of gravitation. It alters nothing but the numerical results. For more complete satisfaction, however, we will enter into the complex cases with the same particularity with which we have stated the simpler one.
§ 3.First, let us introduce the element of cost of carriage. The chief difference will then be, that the cloth and the linen will no longer exchange for each other at precisely the same rate in both countries. Linen, having to be carried to England, will be dearer there by its cost of carriage; and cloth will be dearer in Germany by the cost of carrying it from England. Linen, estimated in cloth, will be dearer in England than in Germany, by the cost of carriage of both articles: and so will cloth in Germany, estimated in linen. Suppose that the cost of carriage of each is equivalent to one yard of linen; and suppose that, if they could have been carried without cost, the terms of interchange would have been 10 yards of cloth for 17 of linen. It may seem at first that each country will pay its own cost of carriage; that is, the carriage of the article it imports; that in Germany 10 yards of cloth will exchange for 18 of linen, namely, the original 17, and 1 to cover the cost of carriage of the cloth; while in England, 10 yards of cloth will only purchase 10 of linen, 1 yard being deducted for the cost of carriage of the linen. This, however, cannot be affirmed with certainty; it will only be true, if the linen which the English consumers would take at the price of 10 for 16, exactly pays for the cloth which the German consumers would take at 10 for 18. The values, whatever they are, must establish this equilibrium. No absolute rule, therefore, can be laid down for the
