eighteen shillings would be more likely to increase than diminish that demand. The rent and profit of barley land, besides, must always be nearly equal to those of other equally fertile and equally well-cultivated land. If they were less, some part of the barley land would soon be turned to some other purpose; and if they were greater, more land would soon be turned to the raising of barley.

When the ordinary price of any particular produce of land is at what may be called a monopoly price, a tax upon it necessarily reduces the rent and profit of the land which grows it. A tax upon the produce of those precious vineyards of which the wine falls so much short of the effectual demand that its price is always above the natural proportion to that of the produce of other equally fertile and equally well cultivated land would