Marx did not think Capital was limited, he saw it as a dynamic process of value creation and accumulation. As a matter of fact he predicts in Kapital Vol2 the precarious everything bubble the traditional market is sitting on top of now thanks to the advent of the finance industry But I sense the similarities you're talking about, and was actually working on a long form post about it this morning before work! I would say that the biggest commonality is the idea of those with their hands on the levers of the economy use that power to ciphon surplus value from the working class, whether you view the main part of that theft to be through the purchasing of labor power or through inflation (or both).