William Petty,
Political Arithmetick — Chapter VII
“ It is not likely that this Discourse will fall into the hands of any that live at 7l. per annum, and therefore such will wonder at this supposition: But if they consider how much the number of the Poor, and their Children, is greater than that of the Rich; although the personal expence of some Rich Men, should be twenty times more than that of a Labourer; yet the expence of the Labourer above mentioned, may well enough stand for the Standard of the Expence, of the whole mass of Mankind. ”
