That is the topic of my latest Bloomberg column, here is one bit:
The most important factors behind trade balances include savings decisions, fiscal policy, economic growth rates, wealth levels and demographic characteristics such as the age of the population. As economist Joseph Gagnon bluntly put it: “None of the studies found any role for trade barriers.”
Currency manipulation can be an important factor, and that has been a problem in the past with China. But it is not a problem right now; if anything, China is propping up the value of its currency. Nor is currency manipulation a problem with Canada, Mexico or the European Union, other targets of Trump’s tariffs.
Insofar as currencies do matter, currency appreciation is one very direct mechanism that limits the potential for tariffs to improve the trade balance. If a country slaps tariffs on imports, that does make those imports more expensive and thus lowers the demand for them. But then the value of the domestic currency will rise, which in turn makes it harder for domestic exporters. There is no guarantee that these effects will cancel each other out exactly, but it is difficult to get much of a trade balance boost through this mechanism, given these offsetting effects.
Standard stuff people, standard stuff. A bunch of you should know better.
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