How large is US supply chain exposure to China really?
Core argument: Accounting for Chinese inputs embedded in goods US manufacturers buy from other foreign suppliers, "look through" exposure to China is almost four times larger than it appears at face value.
US exposure to foreign supply chains is much bigger than it appears at face value, but it is not that big on the macro level. By any measure, the US buys at least 80% of all industrial inputs from domestic sources. Thus, at an aggregate level, its foreign exposure is hardly alarming. However, while this may be reassuring, it is important to note that supply chain disruptions rarely occur at the macro level. The 80% figure was not relevant when the US auto sector shuttered factories due to a lack of semiconductors, or when buying home office electronics became problematic due to a demand surge and logistic snarls. Taking account of the Chinese inputs into all the inputs that American manufacturers buy from other foreign suppliers – what we call look through exposure – we see that US exposure to China is almost four times larger than it appears to be at face value.



