Developing an Effective Market for Open Access Article Processing Charges – Bo-Christer Björk and David Solomon March 2014 (.pdf)
« …This report was commissioned by a consortium of European research funding organizations led by the Wellcome Trust. The study was undertaken to stimulate thinking among research funders who have set up, or are considering setting up, mechanisms for direct “earmarked” funding of article processing charges (APCs) in open access (OA) journals.
The report covers both full OA journals (referred to in the report as “full OA”, such as those published by Biomed Central and PLOS) and subscription journals which offer authors the possibility of making their individual articles OA by paying an APC. This latter category is known as “hybrid OA”.
There are many full OA journals that are funded by means other than APCs and the term “gold OA” also includes these journals. When they are included in the discussion this will be make clear, the focus of the report is however on the segment of gold OA funded by APCs (…) »
source > wellcome.ac.uk, mars 2014