Pity the EU negotiator seeking a US trade agreement with minimal damage

This month’s UK-US trade deal dealt with none of the difficult issues – the complexity of supply chains means anything permanent that involves tariffs will be very challenging to negotiate. Photograph: New York Times Since the Donald Trump regime took office, the world of international trade has descended into chaos. Exporters to the US don't know from one month to the next what tariffs will be payable. Sensibly, the EU has been slow to respond. But if the US does not relent, there will be extra tariffs charged on EU exports, on top of the 10 per cent baseline now…