Nice page. I guess the actual numbers are way worse: For instance, in Germany ~34kEUR is the median <i>gross</i> income. The country has quite a high ratio on income tax and social insurance, making the net income typically in a regime of 30-60% of the gross income. Not to even start about living expenses and rent. Of course same applies for other countries. That's why I said things are even worse :)
An average citizen is not Apple's target market though, especially in poor countries where one excessively impoverished section brings down the whole population's average income. But these countries' marketable section of the population can be as formidable as that in any developed country. Hell, India's potential market is possibly bigger than that of several rich countries combined due to its sheer population size.
An IPhone 14 base model in Nigeria costs $1,571.57 after taxes, where in the US, the cost is $881.64 ($799 + taxes). Why is the cost in Nigeria so much more? Tariffs? Taxes? Even with a US salary that would be pricy. Japan is the least expensive country, $831.43.
since individual states in the US have different sales tax, and supposely also not the same overall median income, I wonder if this information would give any interesting insight.