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Rh of carriage; including the usual profit on the importer's capital, during the time it is locked up, and withheld from other employment.

The value, then, in any country, of a foreign commodity, depends on the quantity of home produce which must be given to the foreign country in exchange for it. In other words, the values of foreign commodities depend on the terms of international exchange. What, then, do these depend upon? What is it, which, in the case supposed, causes a pipe of wine from Spain to be exchanged with England for exactly that quantity of cloth? We have seen that it is not their cost of production. If the cloth and the wine were both made in Spain, they would exchange at their cost of production in Spain; if they were both made in England, they would exchange at their cost of production in England: but all the cloth being made in England, and all the wine in Spain, they are in circumstances to which we have already determined that the law of cost of production is not applicable. We must accordingly, as we have done before in a similar embarrassment, fall back upon an antecedent law, that of supply and demand: and in this we shall again find the solution of our difficulty.

I have discussed this question in a separate Essay, already once referred to; and a quotation of part of the exposition then given, will be the best introduction to my present view of the subject. I must give notice that we are now in the region of the most complicated questions which political economy affords; that the subject is one which cannot possibly be made elementary; and that a more continuous effort of attention than has yet been required, will be necessary to follow the series of deductions. The thread, however, which we are about to take in hand, is in itself very simple and manageable; the only difficulty is in following it through the windings and entanglements of complex international transactions.