No general glut of exchangeable products is possible to take place in this world under natural liberty and just law, because under these the diversity of relative advantage and consequently the profitableness of commercial exchanges is all the time widening everywhere, tending to bring the whole earth into a commercial and blessed union. On the other hand, while a general glut of products is impossible to occur under a decent freedom, a partial glut in respect to certain commodities in certain places is very common. Through want of foresight as to a prospective demand, or miscalculation as to its probable amount, particular services are sometimes offered in too great abundance or of a kind not now adapted to the chosen market, and in respect to these the market may truly be said to be glutted. This frequently happens with editions of books; more copies are printed than can be sold at paying prices. Also, when the fashion changes, which is after all less capricious than is commonly supposed, the goods that were fashionable but are so no longer, are very apt to be somewhere in excess of the demand for them. Nothing can then hinder a partial or total loss in their value in the hands of their last holders. Precautions, however, may well be taken to avoid losses of this character, through the cultivation of foresight, and by studying as accurately as possible the nature of human desires and the not altogether irregular changes that have been observed to take place in them. This constitutes the art of mercantile sagacity; and the most successful producers in all the departments of exchange are those who best develop this attainable sagacity, who adapt their particular services closest to the existing and to the coming demands; who, to excellence in the substance of their products, add taste and attractiveness to their form; and who, as the result of this, tend rather to lead the fashions of the many than to follow in their wake. It cannot be wrong to repeat here in substance, what has indeed been said already in another connection, that Production as a general rule is no dead level of monotonous exertion,--no going forth and coming back on precisely the same track,--since its sphere is Life with all its wants and Man with all his desires; since there is scope and verge enough for the development of ingenious minds in almost all of its departments; and since its ultimate goal is beyond the ken of man.