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This great increase in the quantity of work, which, in

consequence of the division of labour, the same number of people

are capable of performing, is owing to three different

circumstances; first, to the increase of dexterity in every

particular workman; secondly, to the saving of the time which is

commonly lost in passing from one species of work to another;

and, lastly, to the invention of a great number of machines which

facilitate and abridge labour, and enable one man to do the work

of many.