I just noticed this article, thanks to a link posted by Brandon at Siris. I haven't read it yet, but it looks promising (some historical inaccuracies, but Scotus is a full-time job), just the sort of thing I wish were done more often: exposition of text, with some conclusions as to its usefulness on the contemporary scene.
R.I. Mochrie, "Justice in Exchange: The Economic Philosophy of John Duns Scotus" in Journal of Markets and Morality," 9 (2006).
http://www.acton.org/publications/mandm/mandm_article_26.php#ftnt_11
