part of it is just raw obesity increase, but part is also an aging population. even if women today WERE the same size as women of the same age 30 years ago, the average over the total population would still be up.
I can't find a citation now, but I recall reading at some point that weight gain with age (in adulthood) didn't used to happen very much before the obesity epidemic, though nowadays we take it as a given. I wish I could find a source for/against that idea, I'm curious now if it's true.
That is not what they should do according to microeconomics because luxury goods are Veblen goods. Decreasing price would lower demand, at least until they lowered it enough that it was no longer a Veblen good.
Basic microeconomics is just that: basic and thus an oversimplification.
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