“Let us first ask ourselves the question: Can money be organized under the freedom principle? Can we have a free market in money as well as in other goods and services? What would be the shape of such a market? And what are the effects of various governmental controls? If we favor the free market in other directions, if we wish to eliminate government invasion of person and property, we have no more important task than to explore the ways and means of a free market in money.”
Rothbard: What Has Government Done to Our Money? http://mises.org/money.asp