Money doesn’t need a policy, and the monetary system doesn’t need to be run by a government or its central bank. From Jeff Deist a mises.org:
With all due respect to Niall Ferguson, whom I’ve heard of, and Huw van Steenis, whom I’ve not, this tweet is quite preposterous. I’ve personally met more than five people who understand money just in my own circles.
What they mean is “monetary policy,” which is in fact very difficult to understand—given it effectively operates as a political program within the muddled field of macroeconomics. Monetary policy, unlike money per se, is ad hoc, highly technical, reliant on vast amounts of data, and dictated by political expediency.