I am trying to understand to what degree tariffs (or other restrictions like quotas) were the cause of the trade imbalances between the US and China. One might imagine that it was simply a matter of the Chinese making goods more efficiently... So what exactly were (pre-Trump) the level of tariffs (or other restrictions) in US-China trade? Were they actually asymmetric?
EDIT: I found a page about quotas by country on Wikipedia here. It suggests that typical Chinese import tariffs are 7.5% and those in the US are 1.66% - that doesn't feel like enough of an asymmetry to explain the massive trade imbalance... maybe there are some legal or quota issues I have yet to discover...