Market share of the largest publishers in Journal Citation Reports based on journal price and article processing charge

Purpose: There are growing questions about the market share of the largest publishers. Although evaluations based on Journal Citation Reports (JCR) are important, librarians are more interested in journal costs. Therefore, this study was conducted with the aim of estimating the market share of the largest publishers listed in JCR using the journal subscription price (journal price) and article processing charge (APC). Methods: The top 10 publishers were selected based on six indicators in JCR 2014 to 2018, and then their journal prices and APCs were investigated according to list prices. Other prior studies were also compared to estimate their market share more realistically because list and actual prices are not identical. Results: The estimated average price of subscription journals in JCR was 2,300 US dollars and the average APC for an article was 2,652 US dollars. The APC per article was more expensive than the average journal price. Based on journal price and APC, the market influence of the top three publishers was 48.0%, but their market share was estimated to be 55.2% when annual reports and other studies were combined with this study. The difference was due to Elsevier's journal costs, as Elsevier's market share was higher than its market influence. Conclusion: APCs require additional budgetary resources from institutions, but are another revenue source for publishers. Librarians need to reflect APC spending in journal subscription negotiations with the largest publishers. To clarify the market share more accurately, it is necessary to share information on subscription and APC costs paid by institutions.