<p>I suspect the difference is that Duke attracts a higher percentage of students who want to go to business school than Georgetown. Lots of people at Georgetown want to work in the federal government (including, of course, the State Department and the Foreign Service). An MBA isn’t an especially useful degree for that. There are students at Duke with similar ambitions, of course, but far fewer of them than at Georgetown. Conversely, Duke has more people who want to work for investment banks and hedge funds.</p>