Dear Dr. Morrison, I think that you make a very strong assumption of equal distribution of journal sizes, which to me does not hold up to a reality check. Because of this the "average" APC you compute is three to four times lower compared to what authors/institutions actually pay to MDPI per paper in average.
To complete your history of APC changes, you may also want to consider the following websites (or their archived counterparts, in case they are taken offline): http://www.mdpi.com/about/apc-2011 (http://weblock.io/8E4P1NWIOG) http://www.mdpi.com/about/apc-2012 (http://weblock.io/RO6RKQRHM6) http://www.mdpi.com/about/apc-2013 (http://weblock.io/8E4P1NNIQ4) http://www.mdpi.com/about/apc-2014 (http://weblock.io/YVLDG6ZHR1) http://www.mdpi.com/about/apc-2015 (http://weblock.io/3YK2L6RUWD) http://www.mdpi.com/about/apc-2016 (http://weblock.io/6Z4WKM6B2) Kind regards, Dietrich Rordorf E-mail: drord...@gmail.com Tel. +41 76 561 41 83 2016-07-29 16:58 GMT+02:00 Heather Morrison <heather.morri...@uottawa.ca>: > A preliminary version of our MDPI APC longitudinal study is now available: > https://sustainingknowledgecommons.org/2016/07/29/mdpi-apc-fdp-2011-2016/ > > In brief > > MDPI is a new commercial publisher committed to the APC model, with a not > uncommon approach of free publication for new journals. Thanks to Solomon > and Björk, we have APC data for 25 journals for both 2011 and 2016. The > average APC for this group of journals increased from 624 CHF in 2011 to > 1,148 CHF in 2016, an average increase of 524 CHF or an 84% price increase > in contrast to a compound U.S. inflation rate during this time frame of > 8.7% (EU would have been lower). > > From 2014 to 2015, MDPI journals either stayed at the same APC or lowered > their price. From 2015 to 2016, all journals either stayed the same in > price or increased in price, with the average increase 18% or 60 CHF. > > As of March 2016, MDPI listed 155 journals on their website. Of these, > almost half (72) are <<free>>. The average APC is 359 CHF (662 CHF when > non-charging journals are excluded). > > This small case study illustrates the importance for APC payers to take > this model into account to predict future budget needs. MDPI’s overall > average APC today is a fraction of the average charged for a sample of > established journals. > > Note that for purposes of the Sustaining the Knowledge Commons project, > APC journals that are <<free for now>> are categorized as APC journals with > APC of $0, to avoid confusion with journals that are not committed to the > APC approach. > > Thanks to Tanoh Laurent Kakou for data analysis. > > best, > > -- > Dr. Heather Morrison > Assistant Professor > École des sciences de l'information / School of Information Studies > University of Ottawa > http://www.sis.uottawa.ca/faculty/hmorrison.html > Sustaining the Knowledge Commons http://sustainingknowledgecommons.org/ > heather.morri...@uottawa.ca > > > > _______________________________________________ > GOAL mailing list > GOAL@eprints.org > http://mailman.ecs.soton.ac.uk/mailman/listinfo/goal >
_______________________________________________ GOAL mailing list GOAL@eprints.org http://mailman.ecs.soton.ac.uk/mailman/listinfo/goal
