One of my students analyzed the following Economist chart for her homework.
I was looking for it online, and found an interactive version that is a bit different (link). Here are three screen shots from the online version for years 2009, 2013 and 2018. The first and last snapshots correspond to the years depicted in the print version.
The online version is the self-sufficiency test for the print version. In testing self-sufficiency, we want to see if the visual elements (i.e. the circular sectors on the print version) pull their own weights. The quick answer is no. The reader can't tell how much sales are represented in each sector, nor can they reliably estimate the relative scales of print versus ebook (pink/red vs yellow/orange) or year-to-year growth rates.
As usual, when we see the entire data set printed on the chart itself, it is giveaway that the visual elements are mere ornaments.
The online version does not have labels unless you hover over the hemispheres. But again it is a challenge to learn anything from the picture.
In the Trifecta checkup, this is a Type V chart.
This particular dataset is made for the bumps-style chart: