The waste of labour in obtaining the gold, though it cannot be estimated by help of any existing data, may be understood in its bearing on entire economy by supposing it limited to transactions between two persons. If two farmers in Australia have been exchanging corn and cattle with each other for years, keeping their accounts of reciprocal debt in any simple way, the sum of the possessions of either would not be diminished, though the part of it which was lent or borrowed were only reckoned by marks on a stone, or notches on a tree; and the one counted himself accordingly, so many scratches, or so many notches, better than the other. But it would soon be seriously diminished if, discovering gold in their fields, each resolved only to accept golden counters for a reckoning; and accordingly, whenever he wanted a sack of corn or a cow, was obliged to go and wash sand for a week before he could get the means of giving a receipt for them.