An house is of a double nature, viz., one, wherein it is a way and means of expence, the other as it is an instrument and tool of gain.
William PettyIt were good to know how much hay an acre of every sort will bear; how many cattle the same weight of each sort of hay will feed and fatten; what quantity of grain and other commodities the same acre will bear in one, three or seven years; unto what use each soil is proper; all which particulars I call intrinsic value, for there is also another value merely accidental or extrinsic.
William PettyNo man pays double or twice for the same thing, forasmuch as nothing can be spent but once.
William Petty