Better, then, to help developing countries create jobs for their own? The king of Morocco supposedly once told EU leaders that if they did not want his people, they would have to scrap their agricultural subsidies and take his oranges instead. This apocryphal story got things upside-down: emigration in poor countries tends to rise with income per person, up to around $7,500 a year, as people acquire the means to leave. The African migrants who reach Europe via Italy are often among the richer and better-educated. So as Africa gets wealthier, more of its people may decide to chance their hand elsewhere. Some will go to richer parts of their own continent, but plenty will seek the bountiful lands to their north. Europe, look out.