The way I remember it from my college days was that the inputs for the production of wealth are land, labor and capital (and, as you said, sometimes entrepreneurship is listed, although often this is lumped in with labor). Capital is then defined as wealth used towards the production of additional wealth. This formulation avoids the ambiguity that you identified.
The way I remember it from my college days was that the inputs for the production of wealth are land, labor and capital (and, as you said, sometimes entrepreneurship is listed, although often this is lumped in with labor). Capital is then defined as wealth used towards the production of additional wealth. This formulation avoids the ambiguity that you identified.