Walt Crawford as published "The Economics of Open Access" in Cites & Insights: Crawford at Large.
Here's an excerpt:
This essay is primarily about open access, but strays into journal publishing in general. As usual, it's a combination of resources (cites) and commentary (insights), divided into ten overlapping segments. I believe the mèlange will be informative and useful, although I'm certain it won't provide pat answers to most questions, because such answers don't exist.