So here is a case study for how our Marxist labor theorists work:
First you establish a position that is diametrically opposed to Marx; namely that he was wrong to say money has to be a commodity. Second, you “prove” why labor theory also shows why Marx was wrong, because, in your opinion, the “dialectical movement of money as a category” means money loses its commodity character. Third, you declare you are the real Marxist and Marx was just some witless Victorian who did not have the relevant data at his disposal.
Finally, you declare the collapse of the Bretton Woods in 1971 was not the collapse of production on the basis of exchange value, but the “dialectical movement of money as a category”, which you then top off with this sort of completely devious and deliberately misleading statement:
“Nevertheless we cannot deduce from this any sort of a ‘breakdown’ theory of capitalism.”
The actual breakdown of production on the basis of exchange value in 1971 — the collapse of Bretton Woods itself — having been dismissed as unnoteworthy, you are now free to state that there is nothing about the situation after this breakdown that shows the necessity of a breakdown!