I want to know the answer to the following question:
How much did the US prices deflate in the 1930s?
All the background I'm provided with is that "The Federal Reserve initially succeeded in maintaining the value of the U.S. dollar and price stability, reversing the inflation caused by the First World War and stabilizing the value of the dollar during the 1920s, before presiding over a 30% deflation in U.S. prices in the 1930s.". Is that enough to answer the question?
Answer: yes