_Why Substitutions reduce the Displacements of Labor._--The question will, indeed, arise why the burden caused by the change may not be merely transferred to men in industries the products of which are displaced by the substitution. Something of this kind would occur if, in consequence of the cheapening of one article, any one other were generally discarded. The important fact is that it is not any one thing, but a wide range of things which are consumed in smaller quantities in consequence of the change; and the effect on the makers of any one of them is small. If a thousand men begin to buy the _A'''_ of the table we have frequently used, some of them will forego _B'''_, some _C'''_, and so on through the list; and the market for no one of these things will be much affected. Moreover, the nearly universal fact is that a man who begins to buy one article that he never before used will save the price of it by contenting himself with a slightly cheaper quality of a number of others. He will give up a dozen utilities in as many entire commodities in order to be able to buy the one entire commodity that he adds to his purchasing list. The reduction of demand is so extensively subdivided that it causes relatively few displacements of labor. _Substitution a Prominent Cause of Varying Sales of Goods._--Substitution is, then, the general rule whenever the cheapening of a commodity wins new purchasers of it. This practice is not indeed universal in the case of those who formerly consumed these goods. Former purchasers of an article which has become cheaper may make no change except to buy more of it or a better quality of it for the same amount which they have been accustomed to spend for the inferior quality. They are not then obliged to economize in any other direction, and the change does not trench on their consumption of other goods. On the other hand, it is sometimes the case that they continue to use the original amount of the article that has become cheaper and use the liberated means of purchase--the "money," as it would ordinarily be termed--in buying other goods. The cheapening of _A'''_ thus even enlarges the demand for _B'''_, _C'''_, etc. There are thus two cases in which a reduction in the cost of one thing would not decrease the use of other things.