The Wealth of Nations by Part 5 Chapter 2 Page 52

If by such a system of administration a tax of this kind could be so managed as to give, not only no discouragement, but, on the contrary, some encouragement to the improvement of land, it does not appear likely to occasion any other inconveniency to the landlord, except always the unavoidable one of being obliged to pay the tax.

In all the variations of the state of the society, in the improvement and in the declension of agriculture; in all the variations in the value of silver, and in all those in the standard of the coin, a tax of this kind would, of its own accord and without any attention of government, readily suit itself to the actual situation of things, and would be equally just and equitable in all those different changes.

It would, therefore, be much more proper to be