This article by David Miller is widely considered a standard defense of the (once) conventional view on immigration restrictionism, namely that (liberal) states generally have free authority to restrict immigration, save for a few exceptions.

And in this book the distinguished scholar Amartya Sen offers a powerful critique of the theory of social justice that, in its grip on social and political ...

More and more people would like to migrate, but find that every state places barriers in their way. At the same time, most governments not only permit but court foreign investment. Can this difference between the treatment of people and the treatment of money be justified? This book asks this question from the point of view of five different ethical perspectives: liberal egalitarianism, libertarianism, Marxism, natural law and political realism. -- FROM BOOK JACKET.

In this book, she offers a new way of addressing dilemmas of justice and equality in multiethnic, multicultural societies, intervening at this critical moment when so many Western countries are poised to abandon multiculturalism.