As Apple continues spending more on R&D costs will slowly rise to subset cost differences. I believe cost hikes are justifiable , it’s not bleeding edge technologies, but refined and streamlined. Apple has accomplished a lot in terms of computing technology with its proprietary chip technology.
I am sure R&D is not the only factor as well.
Here’s a glimpse on Apple R&D year over year.
https://www.businessinsider.com/apple-rd-spend-charts-2017-2
I am sure R&D is not the only factor as well.
Here’s a glimpse on Apple R&D year over year.
https://www.businessinsider.com/apple-rd-spend-charts-2017-2