The Wealth of Nations by Part 5 Chapter 2 Page 265

the stipulated rent, the salaries of the officers, and the whole expense of administration, the farmer must always draw from the produce of the tax a certain profit proportioned at least to the advance which he makes, to the risk which he runs, to the trouble which he is at, and to the knowledge and skill which it requires to manage so very complicated a concern. Government, by establishing an administration under their own immediate inspection of the same kind with that which the farmer establishes, might at least save this profit, which is almost always exorbitant. To farm any considerable branch of the public revenue requires either a great capital or a great credit; circumstances which would alone restrain the competition for such an undertaking to a very small number of people.

Of the few who have this capital or