50..... (nearly) percent price increase for a new year iPhone. 699 to 999
- Retina Display & front Camera revolution of iPhone 4, increased base price CERO dollars.
- Bigger screen revolution of iPhone 5, increased the base price CERO dollars.
- Touch ID revolution of iPhone 5s, increased the base price CERO dollars
- Bigger screen revolution of iPhone 6, increased the base price CERO dollars (or 100 if you consider the Plus)
- Bigger screen and FaceID of iPhone X, increases the base price 200 or 300 dollars depending you are comparing from Plus, non-Plus versions.
So
2014: iPhone 6
2015: iPhone 6s
2016: should have released iPhone X or at least iPhone 8 design, but we got iPhone 7 a.k.a iPhone 6ss
2017: should have released iPhone X substituting iPhone 7 and nothing more, with the same pricing as iPhone 7, or maximum the Plus pricing. Instead, they release an iPhone 8 a.k.a. iPhone 6sss -with rear glass- to place what had yearly been the new iPhone at a nonsense price.