In order that labour may be productive, it must be aided by machinery. The farmer could do little with his hands, but when aided by the plough and the harrow he may raise much wheat and corn. He could carry little on his shoulders, but he may transport much when aided by a horse and wagon, and still more when aided by a locomotive engine or a ship. He could convert little grain into flour when provided only with a pestle and mortar, but he may do much when provided with a mill. His wife could convert little cotton into cloth when provided only with a spinning-wheel and hand-loom, but her labour becomes highly productive when aided by the spinning-jenny and the power-loom. The more her labours and those of her husband are thus aided the larger will be the quantity of grain produced, the more speedily will it be converted into flour, the more readily will it be carried to market, the larger will be the quantity of cloth for which it will exchange, the greater will be the quantity of food and clothing to be divided among the labourers, and the greater will be the facility on the part of the labourer to acquire machinery of his own, and to become his own employer, and thus to increase that diversification in the employment of labour which tends to increase the competition for its purchase. It will next, we think, be quite clear to the reader that _the nearer_ the grist-mill is to the farm, the less will be the labour required for converting the wheat into flour, the more will be the labour that may be given to the improvement of the farm, and the greater will be the power of the farmer to purchase shoes, hats, coats, ploughs, or harrows, and thus to create a demand for labour. Equally clear will it be that _the nearer_ he can bring the hatter, the shoemaker, and the tailor, the maker of ploughs and harrows, the less will be the loss of labour in exchanging his wheat for their commodities, and the greater will be his power to purchase books and newspapers, to educate his children, and thus to introduce new varieties in the demand for labour; and each such new variety in the demand for that commodity tends to raise the wages of those engaged in all other pursuits. If there be none but farmers, all are seeking employment on a farm. Open a carpenter's or a blacksmith's shop, and the men employed therein will cease to be competitors for farm labour, and wages will tend to rise. Open a mine, or quarry stone and build a mill, and here will be a new competition for labour that will tend to produce a rise in the wages of all labourers. Build a dozen mills, and men will be required to get out timber and stone, and to make spindles, looms, and steam-engines; and when the mills are completed, the demand for labour will withdraw hundreds of men that would be otherwise competitors for employment in the ploughing of fields, the making of shoes or coats, and hundreds of women that would otherwise be seeking to employ themselves in binding shoes or making shirts.