The tariffs are exactly what will spur the investment in US manufacturing, and the marginal benefit of manufacturing in China and then shipping the end product halfway around the world eroded away.
Of course manufacturing is an ecosystem which builds up over time, with positive feedback loops where investment drives further efficiency throughout the supply chain.
All the more reason to raise tariffs now, and hope that they stay high for enough years to stop the ongoing atrophy in the US ecosystem.
It’s not just because China’s an unfair competitor from a labor rights and environmental impact perspective. It’s also a massive national security issue.
The choice isn't just "manufacture in China" or "manufacture in the US". According to Peter Zeihan's The Accidental Superpower (2014), manufacturing in China has gone from being one quarter as expensive as in Mexico to 25% more expensive. He expects that the US shale and natural gas boom will further reduce costs in Mexico and the US.
Also see "[Why China should follow Trump’s example and cut taxes](http://www.scmp.com/week-asia/opinion/article/2056874/why-ch.... Quote: "As far as manufacturing is concerned, according to Cao, everything is cheaper in America apart from manpower."
Well, yeah. But the problem is that China has such a huge head start in all this that all the stuff I said about moving manufacturing to America would apply to Mexico too in terms of having to import components and/or raw materials from China, at least at first.
That said, in terms of national security concerns and such, yes, it would be in America's interest for Mexico to be a manufacturing powerhouse at or near China's level, and I'm sure Trump and his fans would appreciate that a booming Mexico would probably mean less illegal immigration to the US.
This isn't an A or B only choice. There's so many other options than US or China. And it's not just labor/safety, it's building an actual factory (which takes huge time and money commitments) which might be less viable in about 17 months if Trump and his protectionist policy aren't still in office.
But once you’ve started considering that process, maybe you run the numbers and find the marginal cost (an economic term, not to be confused with “small”) of producing locally isn’t as high as you think.
Every company importing from China is doing this analysis. For some percentage of those companies, the numbers will make sense to move into the US. Whether they are building a new local factory or contracting for space on an existing US line.
And it’s not purely “is the US marginally cheaper today,” but the bigger question of; is it less risky overall to produce in the US based on what might happen in the future?
China and the US are not allies, and US companies should see some degree of risk in keeping their production in China.
And I even forgot to mention the rampant intellectual property theft and counterfeiting.