  There are a large number of issues debated in the global justice literature concerning migration, whether temporary, permanent, legal or illegal. These include: Should states have the right to control their borders? Even if they have such a right, should states be more generous in admitting would-be migrants, especially considering the facts about global disparities in life prospects? When affluent developed states refuse to open their borders to the economically disadvantaged, is this equivalent to members of the aristocracy unjustly protecting their privilege as was the case in feudal times? What responsibilities are there to admit more refugees? Can illegal immigration be justified under certain circumstances? What sorts of criteria may affluent developed countries use when selecting migrants from the pool of applicants for citizenship? May they legitimately consider how prospective migrants would fit in with current citizens, favoring certain religious, linguistic, or ethnic affiliations to manage compatibility? When making migrant selection decisions, should they consider the effects on those who remain in countries of origin and if so, is this fair to the would-be migrants who would be excluded on grounds of the alleged negative impacts for home country citizens? If states admit migrant workers, are there moral constraints on how they should be treated? Would admitting temporary workers without simultaneously allowing them a pathway to citizenship be unjust? What responsibilities do we have in relation to human trafficking?