The Great German inflation was caused by a mixture of things including heavy borrowing during the First World War, reparation payments, speculators and poor political decisions. To make matters worse, in early 1923 an already weak economy was hard hit by the occupation of the Rhur by the allies and inflation really took off. This display, by Robert Mott FRPSL, shows the 16 postal rate increases during that year. 

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Click on the first image to view the display.  Once you have done that pages can be enlarged by clicking on the double arrow symbol on the top left: