One of the core tenets of Marx’s work is that capitalism will be undone by internal contradictions that would manifest as ever-greater crises that would eventually destroy the system from within. If it turns out the current version of global capitalism is indeed unraveling due to its internal contradictions, it would be valuable to understand this now rather than later.
Since the failure of communism Marx has been politically incorrect even though what he had to say about capitalism could be of great value.
There are two trends within capitalism, which are wealth creation and wealth concentration. Wealth concentration at some point may hamper wealth creation if the people at the bottom have not enough money to spend to make capital profitable.
The oversupply of capital or the lack of demand caused by lagging wages Marx foresaw may be the primary cause of the low and negative interest rates we have now. After the next recession we may never see positive interest rates again.