If we reckon valuable lands as the _primary_ commodities, then the _secondary_ commodities will be of two classes, namely, (1) the _produce_ of these valuable lands, whether animal or vegetable or mineral, such as cattle and cereals and coal; and (2) vendible material products obtained by human efforts from non-valuable land and sea, such as furs and fish. This division of material commodities into primary and secondary, and the distinction among secondary commodities according as their source is costly and costless, has never before been drawn in Political Economy; and it is fully believed, that the thoughtful reader and student will pretty soon perceive its advantages in helping clear up one of the most confused and perplexing sections of our Science, namely, that which relates to the causes and measures of _Rent_. We are now to inquire into the elements of the _cost of production_ of each of these three classes of commodities; and we may find ourselves surprised at the simplicity and certainty of these elements. _1._ We will now look into the Cost of Production of valuable land-patches themselves, the first and most important class of commodities. Here, as everywhere else in Valuables, we discover certain free gifts of Nature, without whose presence indeed the value could never come into being, but which are not _constituents_ of the value, because they are gratuitous, given of God, and because the natural competition among buyers and sellers inevitably flings out from all effect on value of the otherwise possible action of these free and bountiful gifts, as have been already fully illustrated in chapter first. No piece of land ever yet had one particle of Value until human efforts of some sort had been expended on it or in some connection with it, for two excellent reasons, first, no man would ever even _think_ of saying to another in reference to such a piece of land "Give me something for it and I will pass it over to you," and second, even if he did think of such an absurdity the other would reply "Why should I give you anything for something to which you have not the least claim, especially as I can take for nothing just such pieces all around here?" It must be remembered, not only that God gave the whole earth to all mankind without distinction, but also that his bountiful hand scattered all peculiar kinds of patches in great number upon each of the Continents. There is a plenty of Utility (gratuitous) in land-parcels just as God made them, but no possibility of Value (onerous) till other hands than His have touched and benefited them.