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The 1920s and 1930s were a period of sensational productivity growth: new products were springing up all over the place, and most of those new products and new methods were developed by people who started their own companies.
The 1920s and 1930s were a period of sensational productivity growth: new products were springing up all over the place, and most of those new products and new methods were developed by people who started their own companies.
