A less than 100% reserve monetary standard is prone to inflation, even if it is gold. That is because if banks can accept money deposits and then turn around and loan the money deposited, while still promising it to the depositor, and if, with the government’s blessing, they can get away with calling the value of the loan “money” instead of calling it “debt”, they have created new fiat “money”. Such a fraud cannot be perpetrated without government intervention. It is exactly the case of having one’s cake and eating it too. The cake is the money deposited; if one’s neighbor eats the cake by loaning it out, then one no longer has the cake, only the promise of another cake sometime in the future. The promise of another, different cake in the future is not the same thing as the cake on had to start with, no matter how one wishes to fudge things.
According to Reisman (Capitalism; read his own words before taking this summary as gospel), in a rational capitalist society, where banks cannot perpetrate such a fraud, banks would maintain a 100% reserve gold standard or quickly be put out of business and into prison (speaking only of savings, checking, and similar accounts, it should be understood). Thus, under freedom, money would be inflation-proof.
Incidentally, on a 100% reserve gold standard, the only two basic “currencies” or units of value would be the ounce and the gram, with national currencies, if they exist, being defined as some fixed quantity of gold.