To simplify the consideration of this subject, I have been supposing that a rise in the value of raw materials would affect, in an equal proportion, all home commodities; that if the effect on one were to raise it 10 per cent., it would raise all 10 per cent.; but as the value of commodities is very differently made up of raw material and labour; as some commodities, for instance all those made from the metals, would be unaffected by the rise of raw produce from the surface of the earth, it is evident that there would be the greatest variety in the effects produced on the value of commodities, by a tax on raw produce. As far as this effect was produced, it would stimulate or retard the exportation of particular commodities, and would undoubtedly be attended with the same inconvenience that attends the taxing of commodities; it would destroy the natural relation between the value of each. Thus, the natural price of a hat, instead of being the same as a yard and a half of cloth, might only be of the value of a yard and a quarter, or it might be of the value of a yard and three quarters, and therefore rather a different direction might be given to foreign trade. All these inconveniences would not interfere with the value of the exports and imports; they would only prevent the very best distribution of the capital of the whole world, which is never so well regulated, as when every commodity is freely allowed to settle at its natural price.
Although then the rise in the price of most of our own commodities, would for a time check exportation generally, and might permanently prevent the exportation of a few commodities, it could not materially interfere with foreign trade, and would not place us under any comparative disadvantage as far as regarded competition in foreign markets.
A tax on rent would affect rent only; it would fall wholly on landlords, and could not be shifted to any class of consumers. The landlord could not raise his rent, because he would leave unaltered the difference between the produce obtained from the least productive land in cultivation, and that obtained from land of every other quality. Three sorts of land, No. 1, 2, and 3, are in cultivation, and yield respectively with the same labour 180, 170, and 160 quarters of wheat; but No. 3 pays no rent, and is therefore untaxed: the rent then of No. 2 cannot be made to exceed the value of ten, nor No. 1, of twenty quarters. Such a tax could not raise the price of raw produce, because as the cultivator of No. 3 pays neither rent nor tax, he would in no way be enabled to raise the price of the commodity produced. A tax on rent would not discourage the cultivation of fresh land, for such land pays no rent, and would be untaxed. If No. 4 were taken into cultivation, and yielded 150 quarters, no tax would be paid for such land; but it would create a rent of ten quarters on No. 3, which would then commence paying the tax.