The Irish and European economies are bracing for yet another massive shock. After Covid-19, lockdowns, an energy crisis, war, soaring inflation and multiple interest rate hikes, it looks as if by far the biggest trade shock in living memory is about to hit. On April 2, the US is due to announce swinging tariffs on the EU, very possibly higher than in the 1930s if the threats of US President Donald Trump are to be taken seriously. The EU will retaliate with its own tariffs. That will push up prices for American imports bought by European consumers, both businesses and…