Firstly the Weimar Republic was a unofficial name the official name renamed Deutsches Reich
In a period of 1918 and 1924 German mark suffered from the hyperinflation.
It caused considerable internal political instability in the country, the occupation of the Ruhr by foreign troops as well as misery for the general populace.
The Germans started to buy foreign currency for german marks at any price that increased the breakdown of the value of the mark.
As the mark sank in international markets, more and more marks were required to buy the foreign currency that was demanded by the Reparations Commission.
At the first half of 1922 the mark stable at 320 marks per US dollar.
The meetings produced no workable solution and so inflation changed to hyperinflation, and the mark fell to 7,400 marks per US dollar by December 1922.The cost-of-living index was 41 in June 1922 and 685 in December, a 15-fold increase.
By the end of 1922 the mark was basicly worthless and germany could not pay the war resparations.In January 1923, French and Belgian troops occupied the Ruhr, the industrial region of Germany in the Ruhr valley, to ensure reparations payments. Inflation was exacerbated when workers in the Ruhr went on a general strike and the German government printed more money to continue paying for their passive resistance.By November 1923, the US dollar was worth 4,210,500,000,000 German marks.
