The Theory of Money and Credit - Ludwig von Mises [169]
are put by the individual economic agents do not offset one another but leave a surplus in the one direction or the other This alteration in the size of the national subsistence fund is the most immediate cause of the variation which occurs in the rate of interest; and since, as has been shown, it is by no means unequivocally determined by the extent and direction of the fluctuation in the stock of money in the broader sense, but depends upon the whole social distributive structure, no direct relationship can be established between the variations in the stock of money in the broader sense and the variations in the rate of interest. In fact it is obvious that however great the increase in the stock of money in the broader sense might be, whether it occurred by way of an increase in fiduciary media or by way of an increase in the stock of money in the narrower sense, the rate of interest could never be reduced to zero. That could take place only if the displacements that occurred increased the national subsistence fund to such an extent that all possibilities of increasing production by engaging in more productive "roundabout" methods of production were exhausted. This would mean that in all branches of production the time that elapsed between the commencement of production and the enjoyment of the product was not taken into consideration, and production was carried so far that the prices of the products were only just sufficient to pay an equal return to the primary factors in each employment. In particular, as far as very durable goods are concerned, this would mean that their quantity and durability would be tremendously increased, until the prices of their services fell so low that they would only just provide for the amortization of the investments. It is impossible to conceive of the extent to which, for example, the supply of houses would have to be increased for their annual rental value to fall to a sum which would only just give a total return equal to their original cost by the time when their lengthened lives came to an end. Where the lifetime of a good can be almost indefinitely increased under conditions of decreasing cost, the result is that its services will become practically free goods. It seems hardly likely that a rigid proof could be given to show that the increase in the size of the national subsistence fund that may follow a redistribution of property could never go so far as this. But we have sufficient capacity for estimating the quantities involved without this unobtainable precise proof. As regards the displacements in the distribution of property that are evoked by an increase in the circulation of fiduciary media, it seems that we might go still further and safely assert that it can in no circumstances be very considerable. Although we cannot prove this in any way, whether deductively or inductively, it nevertheless appears a reasonable assertion to make. And we may content ourselves with that; for we do not intend to base any kind of further argument on such an undemonstrable proposition.
The question to which we now turn is the following: It is indisputable that the banks are able to reduce the rate of interest on the credit they grant down to any level above their working expenses (for example, the cost of manufacturing the notes, the salaries of their staffs, etc.). If they do this, the force of competition obliges other lenders to follow their example. Accordingly, it would be entirely within the power of the banks to reduce the rate of interest down to this limit, provided that in so doing they did not set other forces in motion which would automatically reestablish the rate of interest at the level determined by the circumstances of the capital market, that is, the market in which present goods and future goods are exchanged for one another The problem that is before us is usually referred to by the catch-phrase gratuitous nature of credit. It is the chief problem in the theory of banking.
It is a problem whose great theoretical and practical importance has often been overlooked. The chief