This is then the price of the capital good. In other words, it is what consumers pay for the final product that determines the prices of inputs. The view that prices must reflect costs is utterly fallacious. Now the 'real' cost of capital goods is what is sacrificed in order to use them. This is called opportunity cost, a concept that Fist evidently has trouble handling.
Bygones are bygones.
In economics this means that opportunity costs cannot be retrieved. Once the sacrifice is made it is gone forever. Now Fist clearly does not realise the ramifications of this. If a factor is specific it means that it has no other use. Therefore it becomes costless.