The Red Queen and the Hard Reds: Productivity Growth in American Wheat, 1800-1940
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The standard treatment of U.S. agriculture asserts that, before the 1930s, productivity growth was almost exclusively the result of mechanization rather than biological innovations. This paper shows that, to the contrary, U.S. wheat production witnessed a biological revolution during the 19th and
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美国国家经济研究局创建时间：
2002-03-01
