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"That’s the theory. Underlying that theory are the simplifying assumptions that capital and labour are homogeneous and immediately malleable to a new order. For example, manufacturing industry will seamlessly relocate to the United States from China and Vietnam because – as Krugman has argued in the past but now seems intent to distance himself from – large trading partners are characterised by similarities not by heterogeneous comparative advantages."

Yes I find it is strange why anybody would think that changes would take effect instantaneously:

The USA hikes tariffs massively, making these goods unaffordable for the locals so the overseas supply is reduced in response. Domestic production is thus invoked to fill the unsatisfied demand. Overnight.

The thing is, the USA started transferring its manufacturing capacity to the Far East from the late 70s onwards and it can't just be switched back on. For a start the production infrastructure has eroded or been torn down. Skills have been lost or never even developed.

In addition, countries like China have retaliated and the impact on US goods and services being exported will likely wipe out any dubious perceived benefits to the Americans.

A trade war looks to be underway. The pieces are up in the air and who knows where and how they will fall.

But maybe there's one thing of which we can be certain - uncertainty is here to stay for the foreseeable future.

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