From what has been said, we derive the principle that, with respect to given future time periods, our effective requirements for particular goods of higher order are dependent upon the availability of complementary quantities of the corresponding goods of higher order.
When cotton imports to Europe declined considerably because of the American Civil War, requirements for cotton piece goods remained evidently quite unaffected since that war could not change the needs for these goods significantly. To the extent to which there were future requirements for cotton piece goods that were not already met by finished manufactured products, there were also, as a result, requirements for the corresponding quantities of goods of higher order necessary for the production of cotton cloth. Hence these requirements also could not, on the whole, be altered significantly in any way by the civil war. But since the available quantity of one of the necessary goods of higher order, namely raw cotton, declined considerably, the natural consequence was that a part of the previous requirements for goods complementary to raw cotton with respect to the production of cotton cloth (labor services, machines, etc.) became latent, and the effective requirements for them diminished to such quantities as were necessary for processing the available quantities of raw cotton. As soon, however, as imports of raw cotton revived again, the effective requirements for these goods also experienced an increase-to the exact extent, of course, that the latent requirements diminished.
Immigrants, bringing with them viewpoints acquired in highly developed mother countries, often fall into the error of striving from the outset for an extended landed property to the neglect of more important considerations, and even without regard to whether the corresponding quantities of the other goods, complementary to the land, are available in their settlements. Yet nothing is more certain than that they can progress in using the land for the satisfaction of their needs only to the extent that they are able to acquire the corresponding complementary quantities of seed grain, cattle, agricultural instruments, etc. Their course of action betrays an ignorance of the above principle, which makes itself soinexorably felt that men must either submit to its validity or bear the injurious consequences of its neglect.
The further civilization progresses with a highly developed division of labor, the more accustomed do people in various lines become to producing quantities of goods of higher order under the implicit and as a rule correct assumption that other persons will produce the corresponding quantities of the complementary goods. Manufacturers of opera glasses very seldom produce the glass lenses, the ivory or tortoise-shell cases, and the bronze parts, used in assembling the opera glasses. On the contrary, it is known that the producers of these glasses generally obtain the separate parts from specialized manufacturers or artisans and only assemble these parts, adding perhaps a few finishing touches. The glass-cutter who makes the lenses, the fancy-goods worker who makes the ivory or tortoise-shell cases, and the bronze-worker who makes the bronze castings, all operate under the implicit assumption that requirements for their products do exist. And yet nothing is more certain than that the effective requirements for the products of each one of them are dependent upon the production of the complementary quantities in such a fashion that, if the production of glass lenses were to suffer an
interruption, the effective requirements for the other goods of higher order necessary for the production of telescopes, operaglasses, and similar goods, would become latent. At this point,economic disturbances would appear that laymen usually consider completely abnormal, but which are, in reality, entirely in accordance with economic laws.
Taken From : PRINCIPLES OF ECONOMICS
