Trade credit was usually not a problem, as I understand it, as long as "bills of credit" were allowed. They allowed the economy and money supply to expand temporarily to accommodate transactions. But the permanent money supply was tied to the rate of finding gold, a steady laborious process.
Come to think of it if Peter Munk owns gold mines, he might not mind returning to a gold standard.
Central banking is a crazy system but it does expand and contract to fit the economy somewhat autonomously. The money center banks, as counterparties for the NY Fed's Open Market Operations, have undue influence, and as they also pretty much own the system, there's a massive conflict of interest.
Do note though that the Federal Reserve Banks have to return all their profits every year to the Treasury. And their financial statements are audited. Until recently Deloitte did it. Not it's KPMG. Audit opinions are posted on the Board of Governors website, for some reason they're a bit hidden but they are there.