The natural effort of every individual to better his own condition is so powerful that it is alone, and without any assistance, capable not only of carrying on the society to wealth and prosperity, but of surmounting 100 impertinent obstructions with which the folly of human laws too often encumbers its operations.
Adam SmithThus the labour of a manufacture adds, generally, to the value of the materials which he works upon, that of his own maintenance, and of his masters profits. The labour of a menial servant, on the contrary, adds to the value of nothing.
Adam Smith