EconTalk · Russ Roberts

How Did America Build the Arsenal of Democracy? (with Brian Potter)

September 15, 2025·1 hr 5 min·5 clips

The U.S. built more planes in WWII than all commercial aircraft ever made—how did they achieve this impossible feat?

Brian Potter is an engineer, writer, and senior infrastructure fellow at the Institute for Progress whose Substack Construction Physics covers engineering, production systems, and industrial history. His conversation with Russ Roberts explores the American wartime aircraft production program, which he frames as one of the greatest industrial achievements in history: scaling from 3,100 planes per year in 1937 to nearly 100,000 in 1944. The discussion traces three key phases: early British and French orders in the late 1930s that allowed Lockheed, Boeing, Pratt & Whitney and others to begin scaling; Roosevelt's declaration of a 50,000-planes-a-year goal following Germany's invasion of western Europe; and the full conversion of the auto industry — particularly Ford's Willow Run plant — into aircraft manufacturing. Potter explains that the prewar "M-Day" mobilization plan naively assumed civilian industry could simply be switched to military production, and why this failed. He discusses how the supply chain for aircraft engines, aluminum, and machine tools became the binding constraints, not labor or final assembly. The Willow Run bomber plant, a mile-long facility built by Ford, is examined as both an achievement and a case study in the problems of scaling: early production was chaotic due to design changes, workforce turnover, and the fundamental difference between automobile and aircraft manufacturing. Potter also explores the role of the War Production Board, the use of cost-plus contracts, and how pricing incentives shaped output. The conversation addresses whether the achievement was driven by management genius, circumstance, or the sheer scale of American industrial infrastructure. Both agree the feat was less about any single innovation than the aggregate effect of thousands of micro-decisions by tens of thousands of workers and managers. The episode appeals to listeners interested in economic history, industrial policy, manufacturing, and World War II.

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