Information about the variety of business models offered by publishers is provided as well as seminal reports on the topic. 

Additional food for thought:

• Oh! What a Tangled Web We Weave - A Review of Pricing Models and the Forces that Drive Them (web page)
• If I Were a Scholarly Publisher (web page)
• Heading for the open road: costs and benefits of transitions in scholarly communications (web page)
• PeerJ (web page)
• Finch Report