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 were doubled, it is evident that such a quantity only could be permanently brought to market, as would supply the wants of those who were both able and willing to make a sacrifice for the attainment of their wishes, equal to double of what they did before. The quantity of the commodity which would be brought to market under these circumstances might be extremely different. It might be reduced to the supply of a single individual, or might remain precisely the same as before. If it were reduced to the supply of a single individual, it would be a proof that only one of all the former purchasers was both able and willing to make an effectual demand for it at the advanced price. If the supply remained the same, it would be a proof that all the purchasers were in this state, but that the expression of this intensity of demand had not before been rendered necessary on account of the facility with which the article had been previously produced, and the competition of the sellers. In the latter case there would be exactly the same quantity of the commodity supplied, and exactly the same effectual demand for it in regard to extent. But there would be a much greater intensity of demand called forth, the value brought to market to exchange for the commodity in question would have greatly increased; and this may be fairly said to be a most important change in the relation between the demand and the supply of the commodity. Without the increased intensity of demand, which in this case takes place, the commodity would cease to be produced, that is, the failure of the supply would be contingent upon the failure of the will or power to make a greater sacrifice for the object sought.*