Germany suffered from inflation.
In 1921 Germany was faced with the Reparations bill. They paid until 1923.
When Germany could no longer keep up with repayments French & Belgian troops invaded the Ruhr (the most important industrial region in Germany).
People in the area refused to co-operate. Passive resistance led to further decline of the area's industry, more unemployment & poverty.
The Weimar Government responded by printing more money but this led to hyperinflation