Where did Hitler get his finances from?

There is a common saying that war is good for the economy, I have never understood this. To me its almost an oxymoron. How can it be good for the economy to spend crazy amounts on building bombs, tanks, planes, finance an army etc etc

Hitler built the Autobahn, he lowered unemployment.He expanded the army and in other ways built the giant German war machine

Germany was in deep depression at the time with crazy inflation rates.

How did he finance this?

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