labour has once established itself in a community, two principles at once begin to be important, of which time is the very essence. These are First. That as goods are produced to be exchanged, it is good that they should be exchanged as quickly as possible. Secondly. That as every producer is mainly occupied in producing what others want, and not what he wants himself, it is desirable that he should always be able to find, without effort, without delay, and without uncertainty, others who want what he can produce. In themselves these principles are self-evident. Everyone will admit it to be expedient that all goods wanting to be sold should be sold as soon as they are ready; that every man who wants to work should find employment as soon as he is ready for it. Obviously also, as soon as the 'division of labour' is really established, there is a difficulty about both of these principles. A produces what he thinks B wants, but it may be a mistake, and B may not want it. A may be able and willing to produce what B wants, but he may not be able to find Bhe may not know of his existence. The general truth of these principles is obvious, but what is not obvious is the extreme greatness of their effects. Taken together, they make the whole difference between times of brisk trade and great prosperity, and times of stagnant trade and great adversity, so far as that prosperity and that adversity are real and not illusory. If they are satisfied, everyone knows whom to work for, and what to make, and he can get immediately in exchange what he wants'himself. There is no idle labour and no sluggish capital in the whole community, and, in consequence, all which can be produced is produced, the effectiveness of human industry is augmented, and both kinds of producers both capitalists and labourersare much richer than usual, because the amount to be divided between them is also much greater than usual. And there is a partnership in industries. No single large industry can be depressed without injury to other industries; still less can any great group of industries. Each industry when prosperous buys and consumes the produce probably of most (certainly of very many) other industries, and if industry A fail and is in difficulty, industries B, and C, and D, which used to sell to it, will not be able to sell that which they had produced in reliance on A's demand, and in future they will stand idle till industry A recovers, because in default of A there will be no one to buy the commodities which they create. Then as industry B buys of C, D, &c., the adversity of B tells on C, D, &c., and as these buy of E, F, &c., the effect is propagated through the whole alphabet. And in a certain sense it rebounds. Z feels the want caused by the diminished custom of A, B, & C, and so it does not earn so much; in consequence, it cannot lay out as much on the produce of A, B, & C, and so these do not earn as