The whole point of imposing retaliatory tariffs is that it puts pressure on the aggressor to give up, on the basis that you will then immediately drop the retal

The whole point of imposing retaliatory tariffs is that it puts pressure on the aggressor to give up, on the basis that you will then immediately drop the retaliatory tariffs. The point is to produce a quick end. Retaliatory tariffs with a _minimum_ duration would be counterproductive. I suppose you could have a kind of tariff equivalent of the doomsday machine from Dr Strangelove, in principle; a set of automatic measures to come into force if the adversary does [whatever]. However, Trump strikes me as a bit of a General Ripper, so it might not be a _great_ idea.