Adam Smith, The Wealth of Nations:
Whenever the legislature attempts to regulate the differences between masters and their workmen, its counsellors are always the masters. When the regulation, therefore, is in favour of the workmen, it is always just and equitable; but it is sometimes otherwise when in favour of the masters. Thus the law which obliges the masters in several different trades to pay their workmen in money and not in goods, is quite just and equitable.
Adam Smith, Lectures on Jurisprudence:
The rich and opulent merchant who does nothing but give a few directions, lives in far greater state and luxury and ease and plenty of all the conveniencies and delicacies of life than his clerks, who do all the business. They too, excepting their confinement, are in a state of ease and plenty far superior to that of the artizan by whose labour these commodities were furnished. The labour of this man too is pretty tollerable; he works under cover protected from the inclemency in the weather, and has his livelyhood in no uncomfortable way if we compare him with the poor labourer. He has all the inconveniencies of the soil and the season to struggle with, is continually exposed to the inclemency of the weather and the most severe labour at the same time. Thus he who as it were supports the whole frame of society and furnishes the means of the convenience and ease of all the rest is himself possessed of a very small share and is buried in obscurity. He bears on his shoulders the whole of mankind, and unable to sustain the load is buried by the weight of it and thrust down into the lowest parts of the earth, from whence he supports all the rest. (emphasis added)