Revenue is equal to the labour undertaken in the year/National Income, which is equal to v + s, i.e. wages and profit (the latter dividing into rent, interest, taxes, and profit of enterprise), which is also equal to GDP, which measures not the value of output, but only the amount of value added by labour during the year. The total value of output, as Marx sets out, however, is equal not to v = s, but c + v + s, i.e., it also includes the value of all of that consumed constant capital – raw and auxiliary materials, energy, and wear and tear of fixed capital – produced in the previous year/s.
“Since, as we have seen, constant prices and simple reproduction on a given scale are assumed, the money value of the portion which is thus taken from the gross product is equal to two milliard livres. This portion, therefore, does not enter into general circulation. For, as we have noted, circulation which takes place merely within a particular class, and not between one class and another, is excluded from the Tableau.” (p 316)
In other words, the 2 milliards is the amount of consumed means of production/constant capital that must be replaced to maintain production on the same scale – simple reproduction. Given that in simple reproduction, all surplus value is consumed unproductively, the fallacy of the argument put forward by Michael Roberts, set out earlier, is obvious. If all surplus value is consumed unproductively, then, where would the demand for constant capital come from, according to Robert's schema, in which it all comes from profit?
In reality, as Marx sets out in Capital II, and Theories of Surplus Value, there are numerous exchanges – circulation – between producers, but the net effect is they cancel out so that it is the same as if each producer replaces their consumed constant capital, in natura, from their own production, in the same way that a farmer replaces seed from their own production of corn. For example, a coal producer replaces the coal consumed in their steam engines out of the coal they produce, using those steam engines. But, the coal producer also has to replace steel for worn out rails, and so on. They exchange coal for steel. Similarly, the steel producer replaces their own worn out equipment with steel from their own output, but they also replace the coal consumed in their furnaces with coal from the coal producer, exchanged for steel.
As Marx puts it, if all constant capital were produced by one enterprise, it would replace all of its consumed means of production, directly, from its own output. There would be no exchange with revenue/Department II, in respect of this part of its production. There would only be exchange with revenue/Department II, in respect of the replacement of Department II's constant capital, i.e. Department II (c) = Department I (v + s).
“After the replacement of the working capital out of the gross product there remains a surplus of three milliards, of which two milliards are in foodstuffs and one in raw materials. But, the rent which the farmers have to pay the landlords is only two-thirds of this sum, equal to two milliards. It will soon be seen why it is only these two milliards which figure under the heading of “net product” or “net income”.” (p 316)
Again, contrary to Duhring, the importance of analysing the Tableau, and the same applies to Marx's schemas of reproduction, in terms of material balances, and their replacement, is seen, here. Each cycle must begin with existing material balances, be they of raw materials, machines, buildings, and so on, required for production. You cannot produce unless you have something to produce with. It cannot be produced just by an act of current labour. Similarly, workers – and exploiters – cannot wait until production has taken place, before they can consume. At the very least, there must be existing material balances of food, available to consume, whilst production is undertaken.
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