Re Alan's [OPE-L:5025]: While not claiming to be a physicist, "center of attraction" might be a clearer expression of what Marx meant than "center of gravity". This seems most consistent with the following quotation: "The price thus equalised, which divides up the social total of surplus value equally among the individual totals of capital in proportion to their size, is the *price of production* of commodities, the centre around which the oscillation of the market prices moves" (Marx to Engels letter, April 30, 1868). As for the meaning of "center of gravity" in physics, isn't there one generally accepted definition? In solidarity, Jerry
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