You know what colour is almost universally more expensive? Black. On a whole lot of stuff, there's anywhere from a 1% to 10% markup to get it in black. It's a worldwide oppression of Goths, I say.
Interesting that certain people keep pointing out the differences in prices between products featuring licensed properties. Of course there is going to be a difference in price, because of the difference in licensing costs. It has been said before, but deserves to be said again. A "Dora the Explorer" shoe vs. an identically-constructed "Spiderman" shoe? Dora is going to be cheaper, because Spiderman is a much more popular and recognizable brand. Disney vs. Nickelodeon? Nick's going to come up cheaper here, because Disney is more recognizable worldwide, and Disney are seriously money-grubbing bastards who could squeeze blood from a stone. And the moment you stick Barbie on something you're increasing the price by a ridiculous degree just for the licensing costs of one of the world's most recognizable brands.
Oh, and looking back a bit, want to know what's killing Barbie's sales? It's not so much "sexism awareness", the problems with Barbie's proportions are old hat, and no less realistic than the vast majority of male or female toys on the market (Bratz/Monster High anyone?). It's not even whatever flash-in-the-pan Disney is marketing these days (Frozen is still hot, I think). It's Hasbro's My Little Pony: Friendship is Magic. Pastel ponies are destroying Mattel these days; and no body image issues to deal with. (Unless you're a pony, then it might seem a bit unrealistically proportioned and coloured, I mean seriously, what pony can live up to those humongous eyes and painfully extreme cuteness?)
These sorts of comparisons are generally specious, and superficial at best; and ignore common market realities.
Also funny how people are focused on the last few centuries in the UK as epitomizing the status of women in general. Go back a few more and look at the status of women in the Celtic and Scandinavian communities that preceded them. Look at the status of women across the rest of the continent in the contemporary period. Things vary, different peoples have had different cultural standards throughout history.
Assuming it's true, though, that women have been universally oppressed in every culture throughout history (which is far from the truth), why is that? Why has that been so universally true? What is the reason for it? There are only two conclusions that can be reasonably drawn, men are inherently evil and women are inherently victims; or that there are certain unavoidable biological necessities that come into play.
(Oh, and as an aside, someone brought up the issue of Greek statuary in an earlier post regarding body image, as if they were intended to represent an ideal female form. That's nonsense for the most part. The Greeks in general did not idealize females; the forms they used were for their ability to showcase the sculptor's talent in depicting the drapery of the clothing.)