A classic book we should all read: it’s next on my list.
So prices, overall, can change for only two reasons: If the supply of money increases, prices will rise; if the supply falls, prices will fall. If the demand for money increases, prices will fall (PPM rises); if the demand for money declines, prices will rise (PPM falls). The purchasing power of the dollar varies inversely with the supply of dollars, and directly with the demand. Overall prices are determined by the same supply-and-demand forces we are all familiar with in individual prices. Micro and macro are not mysteriously separate worlds; they are both plain economics and governed by the same laws.