Published online by Cambridge University Press: 11 July 2022
U.S. military production during World War II increased at an impressive rate and led to large declines in unit costs. However, the literature has focused on elucidating detailed mechanisms behind this relationship, using small datasets on specific products. Here we take a step back and, looking at an unprecedently large collection of data, we show that both exogenous technological progress and endogenous effects from increasing production experience were important, in roughly similar proportions. The demand for military products was largely exogenous, and the correlation between production, cumulative production, and time was weak, limiting issues of reverse causality and multicollinearity.
This work was supported by the EU grant FP7-ICT-2013-611272 (GROWTHCOM), Partners for a New Economy, Baillie Gifford, the EU grant 730427 (COP-21 RIPPLES), the Rebuilding Macroeconomics project (which is supported by the Economic and Social Research Council), and the Institute for New Economic Thinking at the Oxford Martin School. We would like to thank Kieran Marray for excellent research assistance and Nick Chater, Giovanni Dosi, Cameron Hepburn, David Hendry, Christopher Magee, John Muellbauer, Bill Nordhaus, Matteo Richiardi, our INET colleagues as well as audiences at the CCS 2016, EHS 2018, EEA-ESEM 2019, Singapore NUS, Oxford, MIT, LSE, OECD, CONCORDi 2019, and Waterloo for comments. The usual disclaimer applies.