This is what Marx wrote about the credit system, all those years ago...

The credit system reproduces a new financial aristocracy, a new kind of parasite in the guise of company promoters,
speculators and merely nominal directors; an entire system of swindling and cheating with respect to the promotion of
companies, issues of shares and share dealings.

The credit system...accelerates the material development of the productive forces and the creation of the world
market, which it is the historical task of the capitalist mode of production to bring to a certain level of development, as
material foundations for the new form of production. At the same time, credit accelerates the violent outbreaks of this
contradiction, crises, and with these the elements of dissolution of the old mode of production.

The credit system has a dual character immanent in it: on the one hand it develops the motive of capitalist production,
enrichment by the exploitation of other’s labour, into the purest and most colossal form of gambling and swindling, and
restricts ever more the already small number of exploiters of social wealth; on the other hand however it constitutes
the form of transition towards a new mode of production.

Capital Volume III - Chapter 27 - The Role of Credit in Capitalist Production