Which provision of the treaty of versailles had the greatest economic impact on germany? germany had to spend money to rebuild its military. germany had to buy back lands claimed by the allies. germany had to pay huge reparations for the damages it caused. germany had to pay large fees to join the league of nations.

For Germany signing the treaty of Versailles meant that it was not allowed a large army and lost a large amount of land (e.g. the Rhineland). Germany was also forced to join the league of nations for everyone safety.

The greatest economic impact on Germany was paying back the Allied nations for the damaged caused. The reparations were huge and when Germany couldn't pay France even started taking over important economic properties of Germany such as the Ruhr (massive coal mine of sorts) and brought in their own workers.
The Great Depression also came after world war one putting more economic stress on the already broken Germany.

Militarism is the answer.