That a commodity when taxed can no longer be so profitably exported, is so well understood, that a drawback is frequently allowed on its exportation, and a duty laid on its importation. If these drawbacks and duties be accurately laid, not only on the commodities themselves, but on all which they may indirectly affect, then indeed there will be no disturbance in the value of the precious metals. Since we could as readily export a commodity after being taxed as before, and since no peculiar facility would be given to importation, the precious metals would not, more than before, enter into the list of exportable commodities.
Of all commodities, none are perhaps so proper for taxation, as those which either by the aid of nature or art, are produced with peculiar facility. With respect to foreign countries, such commodities may be classed under the head of those which are not regulated in their price by the quantity of labour bestowed, but rather by the caprice, the tastes, and the power of the purchasers. If England had more productive tin mines than other countries, or if from superior machinery or fuel she had peculiar facilities in manufacturing cotton goods, the prices of tin, and of cotton goods would still in England be regulated by the comparative quantity of labour and capital required to produce them, and the competition of our merchants would make them very little dearer to the foreign consumer. Our advantage in the production of these commodities might be so decided, that probably they could bear a very great additional price in the foreign market, without very materially diminishing their consumption. This price they never could attain, whilst competition was free at home, by any other means but by a tax on their exportation. This tax would fall wholly on foreign consumers, and part of the expenses of the Government of England would be defrayed, by a tax on the land and labour of other countries. The tax on tea, which at present is paid by the people of England, and goes to aid the expenses of the Government of England, might, if laid in China, on the exportation of the tea, be diverted to the payment of the expenses of the Government of China.