In the Libertarian Press translation of Positive Theory of Capital  
(Vol 2 of Capital and Interest), B?hm-Bawerk (p. 80) says "all our  
achievements in the field of production are the result of two  
elemental productive powers and only two. Those two are nature and  
labour."

Elsewhere he uses "originary" as a synonym for elemental. The  
importance for him, from a theoretical perspective, is that all  
adequate explanations must trace their causation back to an origin in  
these elementary factors of production.

Avi Cohen