Evaluating Estimates of Materials Offshoring from U.S. Manufacturing
NBER Working Paper No. 17916
When materials offshoring is measured by estimating imported intermediate inputs, a common assumption used is that an industry’s imports of each input, relative to its total demand, is the same as the economy-wide imports relative to total demand: this is the so-called “import comparability” or “proportionality” assumption. A report to the National Research Council identified this assumption as being a significant limitation of current data collection and analysis. In this note we move beyond this assumption to obtain a direct measure of imported materials by industry for the United States in 1997. At the 3-digit I-O industry level, there is a correlation of 0.68 between the offshoring shares made with and without the proportionality assumption, and a higher correlation of 0.87 when the shares are value weighted. While most value-weighted industry have differences below 50 percentage points in the two estimates, there is significant number of cases that differ by 10 percentage points or more.
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Published: Feenstra, Robert C. & Jensen, J. Bradford, 2012. "Evaluating estimates of materials offshoring from US manufacturing," Economics Letters, Elsevier, vol. 117(1), pages 170-173.
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