It is further important to note that as a country gets more abundant capital, there seems to be a tendency to extend the use of money rather more than the use of many other capital goods. Where the interest rate is 10 and 12%, as in Arizona and New Mexico, money, even when brought in, tends to leave in large degree to bring in other forms of capital which the situation calls for more imperatively. The early American colonies, needing money pressingly, and making shift with a great variety of substitutes for good metallic money, thoroughly acquainted with the advantages of a money-economy from their European experience, and having "habits" as to the carrying and using of money which they had brought with them from Europe, still found it impossible to keep a great deal of metallic money, in view of the still greater importance of other forms of capital. It is in the most highly developed commercial communities, commercial centres, and _par excellence_, in the speculative centres, that the demand for the money-service is most elastic.[242] A country where the rate of interest is low, loses other forms of capital, and gains money, in the process of reëquilibration, as compared with a new and undeveloped section, although the new section also extends the margin of the money service, in effecting a greater number of exchanges, when money is increased.
And this leads to a vital distinction, which quantity theorists almost always lose: the distinction between the volume of _production_, and the volume of _trade_. Even in the mechanical system of causation which they describe, it is true only of production and transportation that _technical_ and _physical_[243] factors are of primary significance, and that money is of minor significance. For trade and commerce, money is always highly important. To the extent that a region is primarily given over to the primary productive activities, mining, and agriculture, such trading as is necessary can be done by means of a small amount of money, supplemented by barter and long-time book-credit. A region or a city whose chief business is _commerce_, however, needs a large part of its capital in the form of money, and of banking capital, which is largely invested in money for banking reserves. _Trade_, as distinguished from industry (and it is after all trade that is under discussion), is helped or hindered as its tools are more or less abundant. These considerations would suggest that the elasticity of the demand for the use of money is greater than the elasticity of demand for the use of capital in almost any other form. Production is, indeed, limited by labor supply and natural resources, in considerable degree. _Trade_,[244] however, even from the standpoint of mechanical causation, is limited chiefly by the relation between the profits to be made in commercial transactions, and the "price" that must be paid for the money and credit that are required to put them through. There are enormous numbers of transfers that could be made to advantage if there were no cost at all involved. They are not made, because exchanging requires pecuniary capital. Let the pecuniary capital increase, however, and sub-marginal exchanges become worth while, the general margin is lowered. Commerce is the most highly flexible and elastic portion of the whole productive process. The elasticity of demand for commercial capital is, thus, greater than the elasticity of demand for any other form of capital.