The european regulations are cheap compared to the legal risks of operating in the states. So, thats not it.You would need to provide some evidence of this since it is completely counter intuitive. Just look at where US treasuries compared with European bonds to compare which countries/continents are viewed as having less legal risks.
Exchange rate? You keep assuming prices are based on costs. They are not. They are based on profit.
You are correct, if French people will pay more for an Apple product and Apple can price discriminate, they will.
So, when the population in a country has more money to spent, or better but, there where the median, rather than the average, income is the highest, the prices will be too.
Well, median income is not the deciding factor for willingness to pay, but would certainly be a contributing factor. Supply and demand equations could be more complex or less complex depending on the situation.
So, its cheap in the US because americans are generally more poor, except for a few that throw the average. Off course, "poor" is a very relative concept in this regard.
This is untrue, proven by the other person's link to wiki.
Income inequality leads to lower prices, and lower margins.
This is untrue also. The price of gold watches and private jet flights are not affected by income inequality, but rather the size of the target segment (wealthy people). A highly polorized economy with 50% really rich vs 50% really poor would by far more jet rides than a country with a distribution toward the center.