Coke is more expensive in Britain thanks to taxation and that's been the case for a long time iirc. Enjoy your libertarianism, earlier in the year my bastard government effectively robbed a third of my chocolate as companies adjusted to another price rise...And where do you think that new tax money is going, huh?! I'll tell you where, children's parks and bowls clubs that I pay for to absolutely no benefit at all. Nobody ever thinks to subsidise the things that would get THE TAXPAYER
out the house like booze and fanny.
But I digress. As >>12651
points out I feel the fad that began around 2006 for bottled water put up the price but it's a non-issue driven by label. I'm not sure I would call either choice irrational though as label does influence taste (we are drinking a noxious syrup), people want more fancy things and more fancy things they shall get.