Where the hell do you think the capital in “capital investment” comes from but underconsumption, i.e. savings, e.g. “money in the bank”? Where the hell does a business get it’s financing from?
This is basic econ. I honestly don’t understand how you can be so off on something so basic, and then not only get so offended when I offer you some links that would help correct your understanding on this sort of stuff, but also suggest that I need to “dig deeper and look behind the curtain”. Perhaps it would be advantageous for you to mind your own garden and look at some basics before you start digging behind any more curtains.