Peter, Certainly www.journalprices.com provides the information about price per artice/price per page/price per citation, measured from the point of view of an individual institutional subscriber to the journal. One obvious limitation of that approach is that the cost-per-citation of OA journals according to that metric is zero. i.e. they offer infinite value! I was agreeing with Ahmed Hindawi that it is also relevant (in fact, I would say, much more relevant) to know the total cost per article to the whole scientific community. That is because, if you take a step back, what publishers do is provide a service to the scientific community, to disseminate articles. You can argue that the cost to the community as a whole is the best measure of how to compare the value-for-money of the service being offered by different publishers to the scientific community. Publishers who take a small amount of money from the academic community, in return for each article publication, article download, or article access, are, other things being equal, offering better value as serviceproviders than publishers who extract a large amount of money from the academic community for an equivalent level of dissemination. To any individual library, the price may be reasonable, in terms of 'what is a reasonable price to pay for access to this excellent research'. But from a funders point of view, that's topsy turvy - its researchers did the research. The amount paid should be proportionate to the service of dissemination provided, not proportionate to how badly it needs access to the research. Article Processing Charges have the virtue of making completely clear how much is being charged for the service of publication and dissemination. Certainly, one of the tasks faced by any publisher is to make sure that their revenue will cover their costs. Since BioMed Central is a commercial organization, I think you can have confidence that we fully intend to achieve that. That doesn't alter the basic fact that if publisher A is charging $1300 to publish and disseminate an article, and publisher B is charging $5000 for an equivalent level of service, publisher A is offering a better deal. Matt