Certain erroneous explanations of the advantages of foreign trade may be dismissed with brief mention. It is said to give vent for surplus production and to give a wider market to what would otherwise go to waste. This involves the same fallacy as the "lump of labor notion," the destruction of machinery, and the praise of waste and luxury.[4] If it were true that sale to backward nations were now necessary to give an outlet for products which would otherwise rot in the warehouses, a time would come at length when the world would have an enormous surplus unless neighboring planets could be successively annexed. Again it is said that the great purpose of foreign trade is to keep exports in excess of imports so that the money of the country may constantly increase in amount. The ideal of such theorists is an impossible condition where the country would constantly sell and never buy.[5] In the narrow commercial view of the subject the sole object of foreign trade is to afford a profit to the merchants, regardless of the welfare of the mass of the citizens. § 3. #Choice of the more advantageous occupations#. Let us consider the cases of two countries somewhat differently situated, such as an old country like England and a newer country such as was the United States in the nineteenth century. Now the relative advantages of various industries in two such countries are very unlike. The newer country excels in its broad area, its abundant rich lands, its bountiful natural resources of forests and mines. These are the superior opportunities which give the economic motives for settlement and for continued immigration from the other lands. Most of the newcomers find it to their advantage to develop the peculiar opportunities of the new land, rather than to go on producing the same things in the same way as they did in the old country.[6] Thus they get a larger quantity of products per day's labor, and are able to gain by trading a part of these for the products of the older country. Thus the characteristic industries of the two countries must differ. Without any government supervision, therefore, but simply through the choice of enterprises, each seeking the best investment of capital for himself, industries are developed in which each country is either most markedly superior, or least inferior, to its neighbors. If either laborers or capitalists in the new country were to turn to the less-favored industries they would be forced to accept a smaller reward than they can earn in the more favored.