European Union leaders are to discuss economic competitiveness and integrating the bloc’s capital markets at a Brussels summit on Thursday. The basis of the discussion is a study from former Italian prime minister Enrico Letta on the future of the EU’s single market, the regulatory system that allows goods, capital, services and people to move freely across the 27 EU member states. Capital markets received the bulk of Letta’s attention, with the bloc urgently seeking new sources of investment to fund defence spending and economic reforms to reduce carbon emissions. Letta said on Wednesday that…