Nauro Campos talks to Viv Davies about his recent research with Fabrizio Coricelli and Luigi Moretti that, using data from the various enlargements since the 1970s, yields new results about the benefits that both rich and relatively poor countries, with the exception of Greece, have derived from becoming EU members. Campos estimates the gain in per capita GDP to be approximately 12%. The interview was recorded on 10 April 2014.