Where is all this extra money coming from, if not from someone else? Inflation - the one action that actually creates more money - accounts for a pretty small p

Where is all this extra money coming from, if not from someone else? Inflation - the one action that actually creates more money - accounts for a pretty small part of it. Without creation of additional money, every dollar earned is someone else’s dollar spent. And yes, I’ve heard theories that the commodities purchased with a dollar are worth more than that dollar, but if that were true, the item would be sold for more; a “rational” capitalist would sell it according to its actual worth.