One of the most important features of our economic resources is their scarcity: land, labor, and capital goods factors are all scarce, and may all be put to various possible uses. The free market uses them 'productively' because the producers are guided, on the market, to produce what the consumers most need: automobiles, for example, rather than buggies.
Economic Controversies (ed. Ludwig von Mises Institute, 2011) - ISBN: 9781610165235