Library Journal includes a brief article about the Article Processing Charge model of open access publishing. This is by no means the only business model for open access publications, but it does account for approximately half of open access articles.
The article indicates that grant funding is increasingly being made available to pay these charges:
Claus Roll, Publishing Editor at EDP Sciences, also believes that available funding for Open Access is increasing, albeit slowly. This is a reflection of changing public policy. “Public and private funders like the NIH or the Wellcome Trust have a say in how their money is used,” he said. “They make Open Access publishing a requirement because they want to give the public insight into their funded research that may have a societal impact.”
Roll noted that while the OA model places a cost requirement on the author and his or her employer (typically absorbed by STEM grant providers), it also provides a tangible financial benefit. Researchers building on the work of others—a fact of life in the scientific community—are less encumbered by costs when accessing others’ OA articles. The “pay it forward” notion is particularly attractive.