Only agricultural labor is valuable; industry and services are simply consumption of the agricultural surplus.
The physiocrats were right
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ee87,
It is a statement about facts and contrasts with implicit idea in neoclassical productions functions (particularly CES) that all factors interact simultaneously and equally in some sense, even if they have different coefficients or weights. But the fact is that there is a hierarchy. There is no capital without labor, but there is no labor without land (and food).