The imitable Heather Morrison, in a [just-released-study](https://sustainingknowledgecommons.org/2019/11/26/2010-2019-apc-update/) updating David Solomon and Bo-Christer Björk's [2010 APC paper](https://onlinelibrary.wiley.com/doi/abs/10.1002/asi.22673):

> The average APC reported by Solomon & Björk was 906 USD; the average in 2019 for the 739 journals for which we have APC data for both years is 1,363 USD. This represents a 50% price increase during this time frame, an increase that is 3 times the inflation rate.

The cost of processing articles has increased 50% in the last nine years. Right?