issue is between definitely and scientifically conceived rival theories, and the practical difficulty before the world is how to provide, not so much a permanent ratio, as a permanent rate of international settlement between countries using different monetary systems, between silver-using and gold-using countries. In the seventeenth century there was no conception of theory at all, and the practical difficulty was how to frustrate the operations of the bullionist and arbitragist and politicians, and the depletion of national treasure due to their activity, and based on a difference of ratio prevailing in different countries.
- The second practical outcome of the revolution was the development of the modern system of control of the flow of gold balances, viz. by means of the bank rate and the arbitrage transactions depending thereon, and on interest and discount rates generally.
The modern theory of international trade does not say that between two particular countries, or at any one particular point of time there is an equivalence of exchange, but that between a circle of commercially interconnected countries, and over a certain cycle of time or operations, there is an equivalence of exchange of goods and services. Movements of currency in the most elementary form assist the process, as far as immediate settlements are concerned; bills of exchange assist it when there is need of deferred payments, as, for instance, when a country imports steadily all the year round, but has only one export time, say after harvest; and, finally, bank and discount rates assist the process by providing currency media at times and places which would otherwise be