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on Tariffs in general, they serve a positive purpose.
Tarrifs help your country keeps its individual economy going, and seeks imports for items that are not practically produced inside their own borders, and exports those items that are impractical to produce in the countries they export to. in the case of the usa, post-WWII there was a need for the USA help prop up and rebuild the economies around the world, tariffs got in the way of that, but, now, those days are long gone. time for the USA to rebuild itself!
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Tariff could actually may improve technology if used wisely.
Imagine if USA had heavy tariff on consumer electronics 20 years ago enough to keep consumer electronics manufacturing state-side, competition within the USA will drive development in manufacturing technology to drive down cost to compete within the USA as well as globally.
That may seem theoretical, but take a look at farming, automation greatly reduced production cost within the EU making farming still viable. EU tariff for agricultural products (pre-current trade war around the corner) average is around 30% and US tariff is around 10% [1]. Without that, EU's farming may long since moved to the Americas (USA, Brazil, Argentina, etc.) or elsewhere. Instead, EU's farming is still viable, EU's automation and robotics likely benefited [2] instead of becoming obsolete - and all these happens without the need of importing labor to do "jobs that Europeans wouldn't do."
That sounds good in theory, but electronics are different to farming.
Suppose a tariff is imposed on consumer electronics? Companies will get round that by importing nearly complete items and finishing them off an automated factory, in the US.
One can base tariff on % content or % value-add instead of basing on completed products. That would stop the "assembled in XXX" but with content largely from YYY.
In my view, with exception to national security type stuff, tariff is not a solution for long term - but a short term thing to dampen abrupt changes. This gives local economy to adjust rather than sudden death. The local economy must have the knowledge and the grit (etc. etc.) to keep itself growing to stay at current or better level of living standard.
What you said about
doing just the finishing locally can work out as bad for farms. The farm technology improvement from the article I linked was mainly in AI and Robotics application. There is nothing there supporting the idea that those would be mainly "home grown" stuff - it may be, but may be not.
Germany sold Kuka (its largest Robotic manufacturer) to China already. Kuka’s facilities in Shanghai is being expanded. Following that kinds of event flow, EU farming may survive by only the veggie or meat grown on EU soil, but everything else is foreign (own or done). This in my view would be an even-worst outcome. The
high value part (AI/Robotics) are gone leaving only the low value grass/plant growing locally. This would the "cow assembled in the EU."
Continuing on with farming to illustrate my point and note that this is
not specific to Germany or farming or electronics. The same applies to different industry and different nations.
What work is being done in Germany to keep itself in play with high-tech manufacturing and AI technology? I don't know. If not, Germany will hollow itself out. There isn't many high-tech stuff that Germany can export to China that China cannot make in five years. So it must use this duration to "re-engineer itself" to find another mean of creating value. As we trade, tariff or not, we must do enough to support the live style we desire.