The government creates, and then rents to us (usury), the money we all use [1]. It holds a monopoly on money creation.
Governments can create money to build infrastructure, hospitals and housing (many leftist governments in Europe have [2]) at will. Government doesn't need to collect taxes to do any of the things I mentioned, that's a myth. External constraints on national budgets are a myth. National budgets are just monetary debts by the government carried by citizens. [3]
[1] Inequality: Why are the rich getting richer? | Positive Money: https://www.youtube.com/watch?v=ZzCegQVljdY
[2] What could Vienna’s low-cost housing policy teach the UK? | Rent controls mean public sector workers and those on lower pay can afford to live and work in the Austrian capital: https://theguardian.com/society/2017/dec/12/vienna-housing-p...
[3] The truth is out: money is just an IOU, and the banks are rolling in it - David Graeber, https://www.theguardian.com/commentisfree/2014/mar/18/truth-...