These German postage stamps are from 1922 or 1923 or thereabout. That’s back when the Weimar Republic (officially named Deutsches Reich) experienced hyperinflation because of circumstances having to do with the aftermath of World War I (1914-1918). You can see that these stamps had their original values overprinted with a new value. For instance, one stamp was originally 100 Mark, but was then overprinted with 1 billion Mark (Mark was the name of the currency in the Weimar Republik). From 100 to 1 billion, this means that if something was earlier sold for one Mark, that same thing will now cost ten million Mark.
If you ever see this happening to postage stamps — or money, or just prices in general — you might do well to pay attention, because it means nothing good. When your leaders are dealing with the problem in ways similar to this, trying to convince you “don’t worry, we got this!” you ought to … well, maybe have some vegetables growing in your garden and some chickens that lay eggs.
Likely, what happens next is some strong man (or a woman, knock yourself out) will present himself and he and his followers will blame the problems on a specific group of people and say “let’s go after those people.” And a whole lot of the population will be excited about this and get behind him, and barbaric ugliness will ensue.