“The Mystery of Banking” Murray N. Rothbard, Chapter 4 – The Supply of Money
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What should the supply of money be? What is the “optimal” supply of money? Should M increase, decrease, or remain constant, and why?
This may strike you as a curious question, even though economists discuss it all the time. After all, economists would never ask the question: What should the supply of biscuits, or shoes, or titanium, be? On the free market, businessmen invest in and produce supplies in whatever ways they can best satisfy the demands of the consumers. All products and resources are scarce, and no outsider, including economists, can know a priori what products should be worked on by the scarce labor, savings, and energy in society. All this is best left to the profit-and-loss motive of earning money and avoiding losses in the service of consumers. So if economists are willing to leave the “problem” of the “optimal supply of shoes” to the free market, why not do the same for the optimal supply of money?
In a sense, this might answer the question and dispose of the entire argument. But it is true that money is different. For while money, as we have seen, was an indispensable discovery of civilization, it does not in the least follow that the more money the better.
Consider the following: Apart from questions of distribution, an increase of consumer goods, or of productive resources, clearly confers a net social benefit. For consumer goods are consumed, used up, in the process of consumption, while capital and natural resources are used up in the process of production. Overall, then, the more consumer goods or capital goods or natural resources the better.
But money is uniquely different for money is never used up, in consumption or production, despite the fact that it is indispensable to the production and exchange of goods. Money is simply transferred from one person’s assets to another. Unlike consumer or capital goods, we cannot say that the more money in circulation the better. In fact, since money only performs an exchange function, we can assert with the Ricardians and with Ludwig von Mises that any supply of money will be equally optimal with any other. In short, it doesn’t matter what the money supply may be; every M will be just as good as any other for performing its cash balance exchange function.[/i]