The production of the current year, assuming simple reproduction, i.e. no accumulation of capital, must first replace those material balances, i.e. must replace the physical use-vales that comprise the means of production (c), and of consumption, (v + s). The physical replacement of these use-values is effected by labour undertaken in the current year, but its value is necessarily greater than the value newly created in the current year, precisely because it includes the value of the consumed constant capital produced in the previous year/s. It does not include the value of the consumed means of consumption, produced in the previous year, because it forms no part of the output of the current year. It is consumed by workers and exploiters to reproduce themselves, but it is not a part of new value production itself.
It is not labour-power that creates new value, but labour. Only the new value created by labour in the current year forms a part of the value of output (v + s), in addition to the preserved value of the consumed constant capital.
So, at the starting point of the Tableau, there are existing material balances of stocks of food and raw materials. Part of these are in the hands of the farmers – the 2 milliards of working-capital. Another part is in the hands of the landlords, who must also consume prior to current production and the payment of their rent out of it. Finally, a part is in the hands of the “sterile class”, the industrial capitalists and workers, in the form of food and raw materials.
Similarly, there are material balances of industrial products. Because the Physiocrats assumed that the “productive class” met its consumption needs from direct production, its stocks of industrial products comprise only means of production. The sterile class also holds stocks of industrial products, both as means of production and consumption. As with Marx's analysis in Capital II, III and Theories of Surplus Value, there are, of course, material balances existing, also, in the form of fixed capital. But, the large part of this fixed capital does not need to be replaced during the year, because only a small part of the fixed capital is consumed, i.e. wear and tear. So, if there are 10 ploughs comprising the fixed capital, and the average life of a plough is 10 years, only 1 plough per year, on average, needs to be replaced out of current production.
In the current year, the gross product of agriculture was 5 milliards, and 2 milliards replaced the working-capital (consumed c + v). Of the remaining 3 milliards, 2 are in food, and 1 in raw materials. The productive class must, however, replace the material balances of agricultural products in the hands of the landlords and sterile class. The farmers pay 2 milliards to the landlords as rent. Because the Physiocrats only see agricultural labour as productive, and the source of the surplus product/value, arising from the land, they see only this 2 milliard as “Net Income”. In other words, it is equal to the surplus product, gifted by the land, and the landowners appropriate it as rent.
“But before the movement described in the Tableau begins, there is also the whole "pécule", two milliards of cash in the hands of the farmers, in addition to the “total reproduction” of agriculture amounting to five milliards in value, of which three milliards enter into general circulation.” (p 316)
As I have set out, elsewhere, if there is only one transaction a year, for example, the farmers buy £1,000 of industrial products from the sterile class, then, the farmers must have this £1,000 as a money hoard. The fact that the sterile class, then, buys £1,000 of agricultural products from the farmers does not change that, but, simply, means that, now, the farmers receive back this same £1,000, replacing their initial cash balance. However, if the farmers buy £100 of industrial products, they only need £100 in cash. Then, this £100 comes back to them, and they can use it again to buy £100 of industrial products. So, instead of 1 transaction per year, 10 transactions per year means that only £100 of money is required. It is why Marx notes that the velocity of circulation of currency is inextricably tied to the rapidity of transactions, i.e. PT = MV.

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