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