Apple already got in trouble for price fixing - a violation of the Sherman antitrust act. https://en.wikipedia.org/wiki/United_States_v._Apple_Inc.
Related to iOS and competition within it, see
http://fortune.com/2016/06/30/elizabeth-warren-apple-google/
http://www.thehill.com/opinion/op-ed/272399-time-to-prosecut...
Hopefully more to come from me on this topic...my channel here. https://medium.com/@ryanpollock
In this instance Apple and the other publishers probably did so specifically because they didn't have a monopoly on ebooks.
In this instance Apple and the other publishers probably did so specifically because they didn't have a monopoly on ebooks.