Real abstraction must take place in the social world before mental abstraction not only becomes possible and even necessary but seems natural and a natural obsession of a thinking being. For instance, Marx writes in _Capital, Vol. 1_:
If then we leave out of consideration the use-value of commodities, they have only one common property left, that of being products of labour. But even the product of labour itself has undergone a change in our hands. If we make abstraction from its use-value, we make abstraction at the same time from the material elements and shapes that make the product a use-value; we see in it no longer a table, a house, yarn, or any other useful thing. Its existence as a material thing is put out of sight. Neither can it any longer be regarded as the product of the labour of the joiner, the mason, the spinner, or of any other definite kind of productive labour. Along with the useful qualities of the products themselves, we put out of sight both the useful character of the various kinds of labour embodied in them, and the concrete forms of that labour; there is nothing left but what is common to them all; all are reduced to one and the same sort of labour, human labour in the abstract.
Marx is not saying that we merely do this abstraction in our heads only. He is explaining that what actually happens with the development of capitalism. All are reduced to one and the same sort of labour, not by Marx's analysis or anyone else's, but by the real historical development of capitalism (and its daily functioning). The primacy of practice before ideas is at stake here.
>There is not so much as a remote echo in the *Odyssey* of
>such an odd idea. Two (or 3 or 4 -- chronology obscure) it
>suddently becomes the life passion of a Plato.
The development of polis, democracy, and free citizens (while Oikos receded in importance) must have made a difference.
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