John Medaille writes, Think about going to the store to buy bread. You would buy, if you are able, as much bread as the family needed, and no more. The exchange has an in-built limitation. But if making money is your only goal, you might buy up every loaf of bread in hopes of cornering the market and making a large profit. There is no natural limit on such exchanges, only contingent limits, such as the amount of market power your wealth commands. I would amend that slightly. The limit is spoilage - that is why God, when dropping manna from heaven, wisely had it spoil overnight. Even gold may be stolen ("... where moth and rust doth corrupt, and thieves break through and steal".) Land, however, generally does not spoil, but rather appreciates. Hence the Isaihac problem of those who "lay field to field, 'til there be no place, that they may be alone in the midst of the Earth". No, I'm not bible-thumping, but one takes wisdom where one finds it! Mason Gaffney