Page:Principles of Political Economy Vol 2.djvu/162

142 when it could be bought at 10 for 17, would probably reduce her consumption to an amount below 10,000 yards, perhaps to the very same number, 9722. Under these conditions the Equation of International Demand would still exist. Thus, the rate of 10 for 17, and that of 10 for 18, would equally satisfy the Equation of Demand: and many other rates of interchange might satisfy it in like manner. It is conceivable that the conditions might be equally satisfied by every numerical rate which could be supposed. There is still therefore a portion of indeterminateness in the rate at which the international values would adjust themselves; showing that the whole of the influencing circumstances cannot yet have been taken into account.

§ 7.It will be found that to supply this deficiency, we must take into consideration not only, as we have already done, the quantities demanded in each country, of the imported commodities; but also the extent of the means of supplying that demand, which are set at liberty in each country by the change in the direction of its industry.

To illustrate this point it will be necessary to choose more convenient numbers than those which we have hitherto employed. Let it be supposed that in England 100 yards of cloth, previously to the trade, exchanged for 100 of linen, but that in Germany 100 of cloth exchanged for 200 of linen. When the trade was opened, England would supply cloth to Germany, Germany linen to England, at an exchange value which would depend partly on the element already discussed, viz. the comparative degree in which, in the two countries, increased cheapness operates in increasing the demand; and partly on some other element not yet taken into account. In order to isolate this unknown element, it will be necessary to make some definite and invariable supposition in regard to the known element. Let us therefore assume, that the influence of cheapness on demand conforms to some simple law, common to both