The Paywall Problem
For most of the twentieth century, the dominant model of academic publishing created a fundamental paradox: research funded largely by public money, conducted at publicly supported universities, reviewed for free by academic volunteers, was published in journals whose access was restricted to institutions wealthy enough to pay increasingly exorbitant subscription fees. A researcher at a well-funded American university might have access to tens of thousands of journals; a researcher at an institution in a developing country, or an independent scholar without institutional affiliation, might have access to almost none. The system simultaneously promoted and restricted the dissemination of knowledge, and its beneficiaries were primarily the handful of large commercial publishers who controlled the most prestigious titles.
The open access movement arose as a direct challenge to this model. Its origins can be traced to the early days of the internet, when physicists began using the preprint server arXiv, founded by Paul Ginsparg in 1991, to share their papers freely before and after formal publication. The Budapest Open Access Initiative of 2002 articulated the principle that peer-reviewed research literature should be freely available online to all who need it, and outlined two complementary strategies for achieving this: self-archiving in open repositories, now called green open access, and publishing in open access journals, now called gold open access.
The Transformation of Academic Publishing
The two decades since the Budapest Declaration have seen dramatic changes in the academic publishing landscape. Funders including the National Institutes of Health in the United States, the Wellcome Trust in the United Kingdom, and most recently major European research councils through the cOAlition S initiative have adopted open access mandates requiring that research they fund be made freely available within defined time periods. These mandates have accelerated the transition toward open access by removing the economic incentive for researchers to publish in subscription-only journals.
The development of open access megajournals, led by PLOS ONE, which launched in 2006 and rapidly became the world's largest scientific journal by article volume, demonstrated that peer review focused on scientific validity rather than novelty or significance could operate at massive scale under an open access model. The journal's article processing charge model, in which authors or their funders pay a fee to cover the cost of publication and the article is then made freely available, has been adopted by a large and growing segment of the publishing industry, including open access journals launched by many of the traditional subscription publishers.
Global Impact and Remaining Challenges
The impact of open access on global research capacity has been substantial and is increasingly well documented. Studies comparing citation rates of open access and subscription articles consistently find that freely available articles are cited more often, suggesting that open access expands the effective research community for any given paper. Researchers at institutions without comprehensive library subscriptions, disproportionately concentrated in the Global South, benefit most directly from free access to the literature in their fields.
Significant challenges remain. The article processing charge model, while workable for well-funded researchers in wealthy countries, creates new barriers for researchers in less well-resourced environments. Predatory publishing, in which journals charge fees while providing no meaningful peer review, has proliferated alongside legitimate open access publishing, creating new challenges for quality control. And the ongoing dominance of a handful of commercial publishers, who have largely retained their market position by acquiring open access journals and charging high article processing fees, suggests that the economics of academic publishing have not yet been fundamentally transformed. The work of the open access movement continues.