Incorporating Energy Into Production Functions

In my last post on my Debtwatch blog, I finished by saying that the Physiocrats were the only School of economics to properly consider the role of energy in production. They ascribed it solely to agriculture exploiting the free energy of the Sun, and specifically to land, which absorbed this free energy and stored it in agricultural products. As Richard Cantillon put it in 1730:

The Land is the Source or Matter from whence all Wealth is produced. The Labour of man is the Form which produces it: and Wealth in itself is nothing but the Maintenance, Conveniencies, and Superfluities of Life. (Cantillon, Essai sur la Nature du Commerce in Général (Essay on the Nature of Trade in General)

Quesnay’s famous but neglected "Tableau Economique" therefore described the agricultural sector as “the productive sector” and manufacturing as “sterile”—see Figure 1.