"The Future of rules and classes." This one is published (in German)
in this month's Segelfliegen. If you don't speak German (like me),
here's the English version

http://faculty.chicagobooth.edu/john...nd_classes.pdf
or, more generally
http://faculty.chicagobooth.edu/john...h/Papers/#misc

Ok, this is the last one for a while.
John Cochrane