What if you bought Apple stock instead of the iPhone 6s?
An iPhone 6s cost $649 in Sep 2015. The same money in Apple stock is worth $7,928 today (12.2x). The iPhone 6s and the other what if I had invested questions are on one page, each with what the money is worth today.

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16GB, full price.
Price only, split-adjusted. Hindsight, not advice.
Price history built 27 Sep 2026.
Sources: en.wikipedia.org