Harvard University: Michael Sandel's "What's the Purpose?"
Watch the rest of this lecture, from 25:51 to the end. Sandel addresses some of the arguments made in the debate over affirmative action as a form of distributive justice. He then introduces Aristotle as an advocate of a very different theory of distributive justice, namely, that social goods, such as jobs, political positions, and material goods, should be distributed based on their purpose. That is, Aristotle would argue that the University of Texas Law School should accept only those who are best suited to studying the law.
Click http://theopenacademy.com/content/lecture-9-arguing-affirmative-action link to open resource.