If, for instance, the soil of the earth had been such, that, however well directed might have been the industry of man, he could not have produced from it more than was barely sufficient to maintain those, whose labour and attention were necessary to its products; though, in this case, food and raw materials would have been evidently scarcer than at present, and the land might have been, in the same manner, monopolized by particular owners; vet it is quite clear, that neither rent, nor any essential surplus produce of the land in the form of high profits, could have existed.