In his “Manifesto of the Communist Party” (1848), published together with Frederick Engels, Karl Marx calls for “measures” — by which he means “despotic inroads on the rights of property” –, which would be “unavoidable as a means of entirely revolutionising the mode of production,” that is, bringing about socialism-communism. Marx’s measure number five reads: “Centralisation of credit in the hands of the state, by means of a national bank with State capital and an exclusive monopoly.” This is a rather perspicacious postulation, especially as at the time when Marx formulated it, precious metals — gold and silver in particular — served as money.
As is well known, the quantity of gold and silver cannot be increased at will. As a result, the quantity of credit (in terms of lending and borrowing money balances) cannot easily be expanded according to political expediency. However, Marx might have fantasized already, what would be possible once the state is put in a position where it can create money through credit expansion; where it has usurped and monopolized the production of money. Long before Marx, the English churchman and historian Thomas Fuller had elaborately expressed the power of money: “Money is the sinew of love as well as war.”
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https://mises.org/wire/why-marx-loved-central-banks