02/06/2016 (Agence Europe) - New OECD analysis of negative costs of leaving EU. According to the OECD, which presented its updated global economic forecasts on Wednesday, 1 June, a Brexit would see growth in British GDP falling by 1.25% to 1.5% by 2018 and by 5% by 2030. Although recent polls have shown the supporters of leaving the EU neck and neck with the remain camp, the international financial organisation is expecting increased uncertainty and falling confidence if the United Kingdom...