The multitude of everyday wants in most households supplied only through commerce shows the extent and importance of this exchange of labor throughout the world. The great advantages, however; may be seen by a little more careful analysis of the growth of individual powers under a ready system of exchange. Every laborer becomes effective by experience in some particular industry. A thousand years will not perfect a single worker in any of the thousands of employments needed to supply his wants. Every farmer knows the weakness of a beginner in farming, coming from any other business; and without exchange, every workman must always be a beginner in everything. Exchange is one of the chief motives to accumulation, since others’ wants as well as our own are kept in view. The “hand to mouth” liver is almost always a man of all work, thinking little of exchange. It is especially a stimulant to saving, since it makes capital itself more useful and brings it directly into competition with all other forces. Products stored in the granary have their significance because of exchange. Still more important is the cultivation of special abilities, impossible without exchange. The indefinitely varied powers of human nature are made most useful where each can devote his talent to a definite business; and usually the talent best fitted to a business is attracted toward it. Habits, too, which are the chief labor-saving characteristics in human nature; become all-important, and enable an individual to do a large part of his work with the least possible care. The routine of everyday life is followed with little effort or pain. The more regular the routine the easier it is to follow. A still greater advantage to communities is found in the enlargement of the range of wants in all individuals. The superiority of enlightened men over savages is largely due to their greatly increased needs, since necessity, the mother of invention, compels exertion and finds the way to satisfaction. It seems, however, that exchange contributes most extensively to welfare by combining individuals into a community, and smaller communities into a larger, until the whole world is brought into sympathy. Thus every human being gains the advantage of growth in mind and character through some contact with every other human being within the commercial world. If ever a reign of peace and plenty shall extend over the world, no one doubts the importance of commerce and intimate exchange in bringing that time. The full advantage of free exchange in promoting human welfare cannot be over-estimated.