Man is the only animal whose desires increase as they are fed; the only animal that is never satisfied.

Planes and other sorts of inert matter (and the most lent item of all—money itself) earn interest indirectly by being part of the same "circle of exchange" with fruitful forms of wealth such as those so that tying up these forms of wealth over time incurs an opportunity cost. Bastiat had asked his readers to consider James and William both carpenters. Economic contributions
George developed what he saw as a crucial feature of his own theory of economics in a critique of an illustration used by Frédéric Bastiat in order to explain the nature of interest and profit.

Henry George (September 2 1839 – October 29 1897) was an American writer politician and political economist who was the most influential proponent of the land value tax also known as the "single tax" on land. He inspired the economic philosophy known as Georgism whose main tenet is that people should own what they create but that everything found in nature most importantly the value of land belongs equally to all humanity.