  The vast bulk of the discussion concerning the morality of immigration concerns the exclusion of outsiders, but some also worry about the way in which wealthy countries currently admit skilled workers from poorer states, especially when the specialists are actively recruited away from their native lands. This practice would not garner the attention of moral theorists if it were restricted to countries like the United States targeting the most talented long-distance runners from Kenya, for instance, but it is thought to rise to the level of injustice when the wealthiest countries actively recruit professionals from developing countries where people with their skill sets are already in terribly short supply. Perhaps the most noteworthy and worrisome instance of this is the manner in which wealthy, western states actively recruit medical professionals away from Africa. As Gillian Brock comments, “Arguably, it is not the total number of health care professionals that exist in the world today that is a problem, but rather their distribution. Consider how, for instance, while only 21 per cent of the world’s population resides in Europe and North America, it commands 45 per cent of the world’s doctors and 61 of its nurses. Africa, which contains 13 per cent of the world’s population, has only 3 per cent of its doctors and 5 per cent of its nurses. An estimated 1.3 per cent of the world’s health care workers provide services to 13.8 per cent of the world’s population in a region suffering 25 per cent of the world’s disease burden.” (Brock 2009: 200)