It is enough to point out that in many cases, where this factor is absent (as in the case of the railroads cited), rising prices attract, and do not repel, foreign gold, and that for none of these cases is the consequence of rising prices for the gold movements to be explained in the simple way that the quantity theory doctrine would require. Finally, the international movements of gold[360] are enormously moved by the short-time rate of interest. The raising of the Bank Rate in England, supplemented, when necessary, by "borrowing from the market" by the Bank of England, as a means of making the Bank Rate effective, quickly turns the course of the exchanges. This is, as has been pointed out, a more effective device when used by the English money-market than when used by borrowing countries, since the borrower, by offering higher rates, is not always able to borrow more, whereas the lender, by demanding higher rates, is usually able to reduce his loans. But the difference is one of degree, and in point of fact a rise in the short time rates in New York City is commonly an effective means of bringing in gold from abroad. It is true that this is not the only factor. I have been at pains to point out how other factors work. I am as far as possible from denying the powerful influence of the "balance of trade" as treated by the older economists on international gold movements, when both visible and invisible items are included. But my point is, first, that these invisible items are numerous and flexible, and that a big factor in their determination is the short time rate of interest; and second, that the balance of physical items, even, depends, not on the price-level as a whole, but merely on the prices of those particular goods which enter into foreign trade. It is perfectly possible, and, indeed, is very common, for rising prices in a country to lead to expanding trade and expanding bank-credit, which causes bankers to wish to expand their reserves, which leads them to raise their rates on short time loans, which leads gold to come in from abroad. More simply still, the bankers may merely offer an attractive rate to the foreign bankers, and establish credits abroad, against which they draw "finance bills," which influence the gold movements in the desired manner. CHAPTER XVII THE QUANTITY THEORY _vs._ GRESHAM'S LAW There is a pretty obvious conflict between the quantity theory and Gresham's Law. The latter is, essentially, a "_quality_" theory of money. For the quantity theory, dodo-bones, or anything else will do. "It is the number, and not the weight, that is essential"![361] For Gresham's Law, the weight makes all the difference in the world, if it is a question as between full weight and light weight coins, and, in general, the _value_ of the thing of which money is made, considered in its commodity aspect, is the starting point of that doctrine.