Thus laws, the barriers interposed by tariffs, etc., may hinder the too-much of one country to flow over into the too-little of another. England, for instance might be suffering from a flood of manufactured articles and the United States from an oppressive depreciation in the value of raw material; but the tariff-laws places a hermetic dike between want on one side and superfluity on the other. Strong national antipathies and great differences of taste stubbornly adhered to may produce similar effects; for instance between the Chinese and Europeans. Even separation in space, especially when added to by badness of the means of transportation may be a sufficient hinderance especially when transportation makes commodities so dear that parties do not care to exchange. In such cases, it is certainly imaginable that there should be at once a want of proper vent or demand for all commodities; provided, we look upon each individual class of commodities the world over as one whole, and admit the exception that in individual places, certain parts of the whole more readily find a market because of the general crisis. Lastly, the mere introduction of trade by money destroys as it were the use of the whole abstract theory.[217-5] So long as original barter prevailed, supply and demand met face to face. But by the intervention of money, the seller is placed in a condition to purchase only after a time, that is, to postpone the other half of the exchange-transaction as he wishes. Hence it follows that supply does not necessarily produce a corresponding demand in the real market. And thus a general crisis may be produced, especially by a sudden diminution of the medium of circulation.[217-6] And so, many very abundant harvests, which have produced a great decline in the value of raw material, and no less so a too large fixation of capital which stops before its completion,[217-7] may lead to general over-production. In a word, production does not always carry with itself the guaranty that it shall find a proper market, but only when it is developed in all directions, where it is progressive and in harmony with the whole national economy. To use Michel Chevalier's expression, the saliant angles of the one-half must correspond to the re-entrant angles of the other, or confusion will reign everywhere. Even in individual industrial enterprises, the proper combination of the different kinds of labor employed in them is an indispensable condition of success. Let us suppose a factory in which there are separate workmen occupied with nothing but the manufacture of ramrods. If these now exceed the proper limits of their production and have manufactured perhaps ten times as many ramrods as can be used in a year, can their colleagues, employed in the making of the locks or butt-ends of the gun, profit by their outlay? Scarcely. There will be a stagnation of the entire business, because part of its capital is