There are two periods of economic problems in Germany in the 1920's. The first involved economic collapse and hyper inflation in the early 20's immediately after WWI. The second started in 1929 and was a deflationary event. Argument I've seen is the sooner a country got off the gold standard the sooner things improved. Everyone but the French did that. Which is to say the solution wasn't rocket science.
You probably meant WWI, but afaik, historians dispute that one. He was not that good in economy.
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