About William Petty:
Sir William Petty was an English economist, scientist and philosopher. He first became prominent serving Oliver Cromwell and Commonwealth in Ireland. He developed efficient methods to survey the land that was to be confiscated and given to Cromwell's soldiers. He also managed to remain prominent under King Charles II and King James II, as did many others who had served Cromwell.
I hope no man takes what I said about the living and dieing of men for mathematical demonstration.
William PettyA thousand acres that can feed a thousand souls is better than ten thousand acres of no more effect.
William PettyNo man pays double or twice for the same thing, forasmuch as nothing can be spent but once.
William Petty