Does import competition explain manufacturing's productivity slowdown?
Core argument: Computer industry productivity declined 12% annually post-2005 vs. -0.2% for wood products, driven by 84% import penetration that shifted production.
We trace a channel of causation from the arrival of imports to declining domestic sales and employment, plant closures, lower profits and capacity utilization, and less investment in fixed capital and R&D. The effect of imports on domestic innovation is more nuanced. Some authors argue that domestic manufacturing and innovation are complements; when production of components is offshored the growing distance from the production process inhibits further improvements that combine design and process innovation. The computer and electronic products industry, which contributed most to the manufacturing productivity growth slowdown, largely offshored production to Asia after 2005. By 2018 its import penetration ratio had reached 84%. This did not occur primarily because of lower labor costs. Instead the attraction of Asia was its emphasis on process innovation. “Manufacturing optimization” leads to the ability to ramp up production quickly at massive scale. Further explanations include government subsidies, geographically concentrated supplier clusters, and support for worker training.