XIV. Exchange Rates

Hume conceded that the fall in the exchange value of a country's currency when for any reason there was adverse pressure on its balance of payments tended to exercise an equilibrating influence by providing an extra incentive to commodity export and a deterrent to commodity import. He held, however, that this could be but a minor factor in the process of adjustment, and although he gave no reasons it may be presumed that he saw that under a metallic standard the maximum possible range of variation of the exchanges, i.e., between the specie export and import points, was so limited as to make it extremely unlikely that such variation could exert an appreciable direct influence on the course of trade. Since his time the maximum range of variation has become still narrower under normal conditions because of reduction in the cost of transporting specie, and scarcely anyone today would dispute that under an international metallic standard exchange variations are a negligible factor as far as their direct influence on commodity trade is concerned. It has sometimes been suggested, however, that this narrowing of the range between the gold points has not been an unalloyed benefit, since by its facilitation of specie shipments it has contributed to the instability of national credit structures. Proposals have been made, starting with Torrens in 1819, artificially to widen the margin between the specie points, by seigniorage charges, premiums on gold for export, different buying and selling prices for gold at the Central Bank, generous tolerance for underweight in the internal specie circulation, differential buying or selling prices for the gold of the particular degrees of fineness most in supply or demand abroad, and other similar devices, and such practices have, for this or other reasons, been followed. To the extent that such practices exist, the range of possible exchange fluctuations under a metallic standard, and therefore the possible influence of exchange variations on the course of trade, can of course be somewhat increased. In effect this is an attempt to retain the advantages of an international metallic standard while escaping in part one of its incidents, namely, the direct dependence of the national stock of money, or of the specie reserves upon which it rests, on the state of the foriegn exchanges. But the same advantages of partial freedom of the quantity of the exchanges can be more safely, and especially for an important financial center whose effectiveness depends largely on its ability to attract foreign short-term funds, more cheaply obtained, by the maintenance of excess specie reserves, than by artificial widening of the range between the gold points. Even with such widening, moreover, unless it were carried to much greater lengths than has ever been customary, the direct influence of exchange rate fluctuations on the course of commodity trade would still be negligible. But even small variations in the exchanges can exert an appreciable influence on the movement of short-term capital funds, and through them on the mechanism of adjustment. This phase of the machanism is discussed in the next chapter, in connection with the discussion of the relation of banking processes to the mechanism.

In their discussion of the foreign exchanges, the writers on the theory of international trade with apparently almost complete unanimity expound a particular error of minor practical importance but revealing lack of due precision in exposition or thought. They hold that when the balance of payments is even, the exchanges will be at their mint par. The correct statement is that when the balance of payments is even the exchanges will be somewhere within the export and import points. The mint par has significance for the exchanges only as a base point from which to determine the specie export and import points. Equilibrium between the amount of foreign bills demanded and offered is as likely to be reached at any one as at any other rate within the limits of the specie points. Except for the approximately fixed limits to the range of possible fluctuation of the exchanges under an international metallic standard, there is no basis for differentiating the theory of the foreign exchanges between two currencies having a common metallic standard, on the one hand, and between two currencies on different standard, on the other hand.