Imagine a new sovereign country, say one with just a few penguin farmers. Call it New Guano. They discover a new element, unobtainium. New Guano is the only supplier. Companies in the USA need unobtainium. They buy it from New Guano. New Guano now has a trade surplus with the USA. Trump slaps on a tariff on New Guano exports. Whatever the US companies are doing with unobtainium, they could now probably do it somewhere other than the USA, without import tariffs.The US essentially saying we're not importing stuff would logically affect non US stock markets negatively as in the companies that comprise them will see sales down.
The Dow will be less affected.
But in real life the US will suffer from product scarcity which means a price hike and ultimately worse off consumers.
Meanwhile elsewhere there will be a glut of unsold products which should lead to price drops.
This is the short term. After a while China et al will cut back on production. Resulting in unemployment.
Whilst the US will have to increase theirs. So they'll have to reverse their immigration policy. Also increased production will require increased investment which may not be on the cards if the US has isolated itself.
The non US economies will have to organise more trade amongst themselves.
All this takes time.
For a more mind-blowing look at Trump's deficit formula, try BBC's More or Less. Apparently the epsilon and phi bits of the formula are usually used, with variable values, in calculating the elasticity effect of tariffs in particular cases. But the Trump team applied values across the board of 4 and 0.25... 4 x 0.25 = 1. They complicated the formula by multiplying the sum by 1!
BBC Radio 4 - More or Less, The mistake in Trump’s tariff formula
Also, counting bobbies, freezing tax and electrocuting redheads
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