[grandalf]

While I respect the pragmatic nature of your argument, I think it's important to understand not just the limit of the system but the underlying mechanisms.

If increasing the money supply is "free", then why not just increase it a whole bunch this year and end poverty?

I think the view you express implicitly puts too much trust in policymakers and assumes the system under study to be more stable than we really have evidence to believe it is. Incidentally it is precisely those two characteristics that led to the crash a few years ago.