How it works
Most of the time prices creep up a little each year. That slow creep is called inflation, and it is normal and hardly noticed.
In Quillby, a made-up village, the mayor printed lots of new notes, but there was not one extra loaf of bread. With more money and the same bread, each note buys less.
Prices doubled each night, so Dani spent her notes the moment she was paid. Notes saved in a jar bought less every day.
This has really happened, in the 1920s in one country in Europe. It ends when the printing stops and a steadier money takes its place.