Arik Hesseldahl, Re/code:
The most costly component in both phones is the combined display and touchscreen. The displays come from LG Display and Japan Display, costing $45 on the iPhone 6 and $52.50 on the iPhone 6 Plus. The cost for the smaller 4.7-inch model is only four dollars more than the four-inch display used on the iPhone 5s.
These numbers are merely estimates by a market research company.