In between the extremes of 'hard money' enthusiasts arguing that the amount of money an economy needs to grow automagically happens to coincide with levels of worldwide gold mining and MMTers (and 1950s Keynesians) arguing it coincides with whatever the government needs to spend is basically the entire field of economics and the mechanism the money supply actually operates based on (which is central banks looking at numbers to ensure the supply of and demand for credit are in balance)