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let us say the labour – of both jointly. The circumstances are such, that if each country confines itself to the production of one commodity, there is a greater total return to the labour of both together; and this increase of produce forms the whole of what the two countries taken together gain by the trade.

      It is the purpose of the present essay to inquire, in what proportion the increase of produce, arising from the saving of labour, is divided between the two countries.

      This question was not entered into by Mr. Ricardo, whose attention was engrossed by far more important questions, and who, having a science to create, had not time, or room, to occupy himself with much more than the leading principles. When he had done enough to enable any one who came after him, and who took the necessary pains, to do all the rest, he was satisfied. He very rarely followed out the principles of the science into the ramifications of their consequences. But we believe that to no one, who has thoroughly entered into the spirit of his discoveries, will even the minutiae of the science offer any difficulty but that which is constituted by the necessity of patience and circumspection in tracing principles to their results.

      Mr. Ricardo, while intending to go no further into the question of the advantage of foreign trade than to show what it consisted of, and under what circumstances it arose, unguardedly expressed himself as if each of the two countries making the exchange separately gained the whole of the difference between the comparative costs of the two commodities in one country and in the other. But, the whole gain of both countries together, consisting in the saving of labour; and the saving of labour being exactly equal to the difference between the costs, in the two countries, of the one commodity as compared with the other; the two countries taken together gain no more than this difference: and if either country gains the whole of it, the other country derives no advantage from the trade.

      Suppose, for example, that 10 yards of broad cloth cost in England as much labour as 15 yards of linen, and in Germany as much as 20. If England sends 10 yards of broad cloth to Germany, and is able to exchange them for linen according to the German cost of production, she will get 20 yards of linen, with a quantity of labour with which she could not have produced more than 15; and will gain, therefore, 5 yards on every 15, or 33-1/3 per cent. But in this case Germany would obtain only 10 yards of cloth for 20 of linen. Now, 10 yards of cloth cost exactly the same quantity of labour in Germany as 20 of linen; Germany, therefore, derives no advantage from the trade, more than she would possess if it did not exist.

      So, on the other hand, if Germany sends 15 yards of linen to England, and finding the relative value of the two articles in that country determined by the English costs of production, is enabled to purchase with 35 yards of linen 10 yards of cloth; Germany now gains 5 yards, just as England did before, – for with 15 yards of linen she purchases 10 yards of cloth, when to produce these 10 yards she must have employed as much labour as would have enabled her to produce 20 yards of linen. But in this case England would gain nothing: she would only obtain, for her 10 yards of cloth, 15 yards of linen, which is exactly the comparative cost at which she could have produced them.

      This, which was not an error, but a mere oversight of Mr. Ricardo, arising from his having left the question of the division of the advantage entirely unnoticed, was first corrected in the third edition of Mr. Mill's Elements of Political Economy. It can hardly, however, be said that Mr. Mill has prosecuted the inquiry any further; which, indeed, would have been quite as inconsistent with the nature of his plan as of Mr. Ricardo's.

      1. When the trade is established between the two countries, the two commodities will exchange for each other at the same rate of interchange in both countries – bating the cost of carriage, of which, for the present, it will be more convenient to omit the consideration. Supposing, therefore, for the sake of argument, that the carriage of the commodities from one country to another could be effected without labour and without cost, no sooner would the trade be opened than, it is self-evident, the value of the two commodities, estimated in each other, would come to a level in both countries.

      If we knew what this level would be, we should know in what proportion the two countries would share the advantage of the trade.

      When each country produced both commodities for itself, 10 yards of broad cloth exchanged for 15 yards of linen in England, and for 20 in Germany. They will now exchange for the same number of yards of linen in both. For what number? If for 15 yards, England will be just as she was, and Germany will gain all. If for 20 yards, Germany will be as before, and England will derive the whole of the benefit. If for any number intermediate between 15 and 20, the advantage will be shared between the two countries. If, for example, 10 yards of cloth exchange for 18 of linen, England will gain an advantage of 3 yards on every 15, Germany will save 2 out of every 20.

      The problem is, what are the causes which determine the proportion in which the cloth of England and the linen of Germany will exchange for each other?

      This, therefore, is a question concerning exchangeable value. There must be something which determines how much of one commodity another commodity will purchase; and there is no reason to suppose that the law of exchangeable value is more difficult of ascertainment in this case than in other cases.

      The law, however, cannot be precisely the same as in the common cases. When two articles are produced in the immediate vicinity of one another, so that, without expatriating himself, or moving to a distance, a capitalist has the choice of producing one or the other, the quantities of the two articles which will exchange for each other will be, on the average, those which are produced by equal quantities of labour. But this cannot be applied to the case where the two articles are produced in two different countries; because men do not usually leave their country, or even send their capital abroad, for the sake of those small differences of profit which are sufficient to determine their choice of a business, or of an investment, in their own country and neighbourhood.

      The principle, that value is proportional to cost of production, being consequently inapplicable, we must revert to a principle anterior to that of cost of production, and from which this last flows as a consequence, – namely, the principle of demand and supply.

      In order to apply this principle, with any advantage, to the solution of the question which now occupies us, the principle itself, and the idea attached to the term demand, must be conceived with a precision, which the loose manner in which the words are used generally prevents.

      It is well known that the quantity of any commodity which can be disposed of, varies with the price. The higher the price, the fewer will be the purchasers, and the smaller the quantity sold. The lower the price, the greater will in general be the number of purchasers, and the greater the quantity disposed of. This is true of almost all commodities whatever: though of some commodities, to diminish the consumption in any given degree would require a much greater rise of price than of others.

      Whatever be the commodity – the supply in any market being given, there is some price at which the whole of the supply exactly will find purchasers, and no more. That, whatever it be, is the price at which, by the effect of competition, the commodity will be sold. If the price be higher, the whole of the supply will not be disposed of, and the sellers, by their competition, will bring down the price. If the price be lower, there will be found purchasers for a larger supply, and the competition of these purchasers will raise the price.

      This, then, is what we mean, when we say that price, or exchangeable value, depends on demand and supply. We should express the principle more accurately, if we were to say, the price so regulates itself that the demand shall be exactly sufficient to carry off the supply.

      Let us now apply the principle of demand and supply, thus understood, to the interchange of broadcloth and linen between England and Germany.

      As exchangeable value in this case, as in every other, is proverbially fluctuating, it does not matter what we suppose it to be when we begin; we shall soon see whether there be any fixed point about which it oscillates – which it has a tendency always to approach to, and to remain at.

      Let us suppose, then, that by the effect of what Adam Smith calls the higgling of the market, 10 yards of cloth, in both countries, exchange for 17 yards of linen.

      The demand for a commodity, that is, the quantity of it which can find a purchaser, varies, as we have before remarked, according to

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