Because people are willing to pay more, price is set at the highest level that does not depress demand too much.

It may be that locals will drink  the cheaper coke, but travellers are willing to pay more for the Diet, so allowing the market to be segmented.

Why is Diet Coke more expensive than regular Coca-Cola and other soft drinks in Indonesia?
I'm looking at this Ted talk about a Saudi Arabia woman who dared to drive a car in the last few years. This reminds me that until the last century or so, women (all over the world?) enjoyed less rights and might've been pigeonholed into roles predetermined by society. Those roles might've encouraged certain traits, and discouraged others. Those who did not conform might've been punished, like the woman in the talk above received death threats and was jailed.

This sounds to me like selective pressure, did it really exist, and did it have any effect on the genetics/traits of modern women?

This makes me interested in the question - compared to other species, are men and women more genetically different because of selective pressure put on women to conform to male-dominated world for thousands of years before 19th century?
