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Thus,
back to x of A exchanges for y of B.
In the real world: x of A equals y of B, z
of C, w of D and so on and so forth.
Reversing this reveals that A itself is money. Thus, money is just a sort of
commodity but it functions differently from others because it can be easily used
to express them. But it can do this only because it represents a certain value
of abstract labor, just like any other commodity.
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