For mid-career artists especially, it’s important to know that things have changed from when you were in art school. If you’re operating on the ideas and assumptions you formed 20 (or 30) years ago, you may be trying to navigate the contemporary art world in a Datsun—or an Edsel.
http://joannemattera.blogspot.com/2009/06/marketing-mondays-artists-guide-and.html