From the U.S. - Anti-Dumping and Countervailing Duties (China) (DS379) AB report:
498. We do not consider that the Panel was wrong in drawing a distinction between a government's role in implementing monetary policy, on the one hand, and market distortions that may result from governmental participation and intervention in the commercial lending market, on the other hand. While the first is a necessary element of all commercial lending markets, ...
Do we really need the government to play a role in implementing monetary policy in order to have commercial lending markets? There's always this:
Free banking refers to a monetary arrangement in which banks are subject to no special regulations beyond those applicable to most enterprises, and in which they also are free to issue their own paper currency (banknotes). In a free banking system, market forces control the supply of total quantity of banknotes and deposits that can be supported by any given stock of cash reserves, where such reserves consist either of a scarce commodity (such as gold) or of an artificially limited stock of "fiat" money issued by a central bank. In the strictest versions of free banking, however, there either is no role at all for a central bank, or the supply of central bank money is supposed to be permanently "frozen." There is, therefore, no agency capable of serving as a "lender of last resort" in the usually understood sense of the term. Nor is there any government insurance of banknotes or bank deposit accounts.
But I suppose we are highly unlikely to see anything like that in practice ...