The elder Mirabeau, we are told, ranked the proposition of Quesnay, to substitute one single tax on rent (the impost unique) for all other taxes, as a discovery equal in utility to the invention of writing or the substitution of the use of money for barter.

To whoever will think over the matter, this saying will appear an evidence of penetration rather than of extravagance. The advantages which would be gained by substituting for the numerous taxes by which the public revenues are now raised, a single tax levied upon the value of land, will appear more and more important the more they are considered. This is the secret which would transform the little village into the great city. With all the burdens removed which now oppress industry and hamper exchange, the production of wealth would go on with a rapidity now undreamed of. This, in its turn, would lead to an increase in the value of land—a new surplus which society might take for general purposes. And released from the difficulties which attend the collection of revenue in a way that begets corruption and renders legislation the tool of special interests, society could assume functions which the increasing complexity of life makes it desirable to assume, but which the prospect of political demoralization under the present system now leads thoughtful men to shrink from.