When money lost its value, so that German kids played with it in the streets...

...it was inflation or deflation. It was the fascist socialist program who's focus was killing the Jews, which turned the money into rubbish.

Anyone country or individual can print enough money, so that it's not worth the paper it's printed on.

Jews have always been the stewards of money. Nazi displacement of this fact led to genocide; subsequent Teutonic children ignorantly playing with the paper symbol of lost Jewish lives. Not much different than playing with 'snow,' when in reality it was Jewish bone ground to dust in the 'gas chambers.'

Misguided and macabre, but world economic crisis is not always as simple as supply versus demand. The kids in our story did not know any better. That same rubbish would probably have spent quite well in New York City, if they somehow had gotten on a steamer and crossed the Atlantic.