1. Although not as common-sensical as Fine’s (1986b) “natural ontological attitude” perhaps.
2. One may ask how — and even if — it is possible to distinguish between conceptual and linguistic levels without giving a clear and valid answer to the question of whether it is possible to think without language. I am however not making rigid distinctions here. What I am doing, in fact, is to depict the development of scientific research by emphasising one by one the real, conceptual, and linguistic aspects of this evolutionary process. And, moreover, I am claiming that there always is interplay between these aspects.
3. Think, for example, of students able to cite all the rules (or laws) of a specific area of their subject matter, who are still unable to apply this knowledge in any concrete way.
4. See for instance Balzer's articles "A logical reconstruction of pure exchange economics" (1982), and "The proper reconstruction of exchange economics" (1985)
5. Hands's article "The structuralist view of economic theories: A review essay" (1985)