The phrase "financial pollution" recently came to mind in the context of foreign investors buying and sitting on real estate and driving up costs for local residents. I think the phrase may apply to a lot of things.

Keynes seems to have been right about the problems of "saving beyond planned investment." It seems to create even more problems than he imagined. A little of it does end up finding interesting important ventures but most of it is big dumb money that chases bubbles or gets parked in socially destructive rent seeking operations. Money is made for some investors but the overall ROI for civilization is a net negative; making money by destroying wealth.