First, as those machines and instruments of trade, etc., require a certain expense, first to erect them, and afterwards to support them, both which expenses, though they make a part of the gross, are deductions from the net revenue of the society; so the stock of money which circulates in any country must require a certain expense, first to collect it, and afterwards to support it, both which expenses, though they make a part of the gross, are, in the same manner, deductions from the net revenue of the society. A certain quantity of very valuable materials, gold and silver, and of very curious labour, instead of augmenting the stock reserved for immediate consumption, the subsistence, conveniencies, and amusements of individuals, is employed in supporting that great but expensive instrument of commerce, by means of which every individual in the society has